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Normal Egg
Member Lvl: 8
Egg Points: 14020
Posts: 1079
Posted: Jun 12, 2008 2:36 a.m. - Subject: Correct my quiz Please.
I recently did this exam but I am not 100% on some of the questions. It would be great if somone could tell me which answers are wrong/right. Therre is a questions that are missing info like a graph or table, just ignore those ones. A: (my answer)
Question 6 (Essay Worth 1 points)
We toss two dice. What is the probability that the sum of the faces equals 8? (Give your answer as a fraction, not as a decimal.)
A:3/12
Question 8 (Essay Worth 1 points)
We perform the experiment "toss three coins" 1,000 times. How many times do you expect that the event "no heads" will occur?
A: 3/8
Question 9 (Fill-In-The-Blank Worth 1 points)
If the table below represents the number of cars sold in September, who sold the least?
Salesperson
Number of Cars Sold
Frank
25
Sara
20
Randy
15
Braheem
22
Alice
20
A: Randy
Question 10 (Multiple Choice Worth 1 points)
Salesperson
Number of Cars Sold
Frank
25
Sara
20
Randy
15
Braheem
22
Alice
20
What is the mean number of cars sold for this month?
20
22
20.4
21
A:20.4
Question 11 (Multiple Choice Worth 1 points)
Salesperson
Number of Cars Sold
Frank
25
Sara
20
Randy
15
Braheem
22
Alice
20
What is the median number of cars sold this month?
20
22
20.4
21
A:20
Question 12 (Fill-In-The-Blank Worth 1 points)
What is the median of this set of data? Express your answer as an integer.
10 11 12 12 15 19 20 21 22
A:15
Question 13 (Multiple Choice Worth 1 points)
Salesperson
Number of Cars Sold
Frank
25
Sara
20
Randy
15
Braheem
22
Alice
20
What is the mode for the month?
20
22
20.4
21
A:20
Question 14 (Multiple Choice Worth 1 points)
The manager posted this graph to show the numbers of vehicles leased. How many Vans were leased?
10
15
20
25
A:20
Question 15 (Fill-In-The-Blank Worth 1 points)
What is the mode of this set of data? Express your answer as an integer.
10 11 12 12 15 19 20 21 22
Answer for Blank 1:
A:12
Question 16 (Fill-In-The-Blank Worth 1 points)
What is the mean of this set of data? Express your answer as a decimal number, rounded to the tenths place.
78 79 80 80 89 89 92 93 94 95 95 95
Answer for Blank 1:
A:88.3
Question 17 (Multiple Choice Worth 1 points)
How many more SUV’s were leased than 2 Door Sedans?
40
45
50
55
A:55
Question 18 (True/False Worth 1 points)
We perform the experiment "Toss Three Coins". Then the events "No Heads appear" and "Exactly 1 Head appears" are equally likely.
True
False
A:False
Question 19 (Multiple Choice Worth 1 points)
We toss three coins. What is the probability of the event "3 Heads appear"?
1/4
3/8
1/8
1/2
A:3/8
Question 20 (Multiple Choice Worth 1 points)
We perform the experiment "Toss two dice". What is the probability of the event "the sum of the faces equals 5"?
4/36
1/36
1/6
5/36
A:4/36
Question 21 (Multiple Choice Worth 1 points)
We perform the experiment "Toss two dice". What is the probability of the event "no 3 appears on either face"?
10/36
11/36
1/36
25/36
A: 25/36
Question 22 (Multiple Choice Worth 1 points)
If we draw a card from a deck of 52 playing cards, what is the probability that it is a queen?
1/52
1/26
1/13
1/4
A:1/13
Question 23 (Fill-In-The-Blank Worth 1 points)
There are 52 cards in a deck. There are 4 Aces. What is the probability that if you cut the deck, you’ll get an Ace? Express your answer as a fraction with no spaces. Reduce the fraction to its simplest form.
Answer for Blank 1:
A:1/13
Question 24 (Multiple Choice Worth 1 points)
There are 6 numbers on a normal dice. What is the probability that if you roll the dice, you’ll get the number 100?
0
1/4
1/6
1/100
A:0
Question 25 (True/False Worth 1 points)
If we toss a coin 100 times, then Heads will necessarily appear exactly 50 times.
True
False
A:False
Question 26 (Fill-In-The-Blank Worth 1 points)
There are 52 cards in a deck. There are 4 threes and 4 fives. What is the probability that if you cut the deck, you’ll get a three or a five? Express your answer as a decimal number rounded to the hundredths place. Place a 0 to the left of the decimal point, and don’t put any spaces in your answer
Answer for Blank 1:
A:.15
Question 27 (True/False Worth 1 points)
If we toss a coin 100 times, then we expect that Heads will appear 50 times.
True
False
A:True
Question 28 (Fill-In-The-Blank Worth 1 points)
There are 52 cards in a deck. There are 13 different cards in the deck that are clubs. What is the probability that if you cut the deck, you’ll get a club? Express your answer as a percent. Include the percent sign at the end of your number, and don’t put any spaces in your answer.
Answer for Blank 1:
A:25
Question 29 (Multiple Choice Worth 1 points)
We toss 3 coins 100,000 times. How many times do we expect to see "Exactly 1 Head" appearing?
12,500
37,500
3,750
50,000
A:3750
Question 30 (Multiple Choice Worth 1 points)
We toss two dice 1,000 times. How many times do we expect to have the sum of the two dice equal to 4?
about 250
about 167
about 83
about 42
A:about 250
Question 31 (Fill-In-The-Blank Worth 1 points)
There are 6 numbers on a normal dice. What is the probability that if you roll the dice, you’ll get a 3? Express your answer as a fraction with no spaces. Reduce the fraction to its simplest form.
Answer for Blank 1:
A:1/6
Question 32 (Fill-In-The-Blank Worth 1 points)
There are 6 numbers on a normal dice. What is the probability that if you roll the dice, you’ll get a 5 or a 6? Express your answer as a fraction with no spaces. Reduce the fraction to its simplest form.
Answer for Blank 1:
A:1/3
Question 33 (Multiple Choice Worth 1 points)
Evaluate: 30 - m/6 for m = 30.
25
0
6
1
A:0
Question 34 (Multiple Choice Worth 1 points)
Write as a mathematical expression. The product of 5 and x.
5+x
5 - x
5x
5/x
A:5x
Question 35 (Fill-In-The-Blank Worth 1 points)
Solve for x.
3x = -9
Answer for Blank 1:
A:-3
Question 36 (Fill-In-The-Blank Worth 1 points)
Solve for x.
x - 2 = 10
Answer for Blank 1:
A:12
Question 37 (Multiple Choice Worth 1 points)
Write as an algebraic expression: 22% of a.
0.22a
0.22 + a
0.22 / a
0.22 - a
A:.22a
Question 38 (Fill-In-The-Blank Worth 1 points)
Solve for x.
(1/3)x = 10
Answer for Blank 1:
A:????
Question 39 (Multiple Choice Worth 1 points)
Evaluate ab + c for a= 2, b = 5, c = 4.
18
22
14
20
A:14
Question 40 (Multiple Choice Worth 1 points)
Evaluate: for x = 6, y = 9, z = 2.
3
4
5
6
Question 42 (Multiple Choice Worth 1 points)
Write an algebraic expression for the word phrase: 8 more than the product of 6 and n.
6(8 + n)
8(6 + n)
8 + 6 + n
8 + 6n
A:8+6n
Question 43 (Fill-In-The-Blank Worth 1 points)
This chart shows the car colors chosen among Sandra’s customers for the week of June 4th. Using the chart, find the experimental probability that a customer will choose a black car. P(Black) = _____? Write as a decimal rounded to the nearest hundredth place.
Answer for Blank 1:
A:3.20
Question 44 (Fill-In-The-Blank Worth 1 points)
There are six open containers arranged as shown. A ball is tossed and falls into one of the containers. Find P(a number greater than 2). Write your answer as a fraction (i.e., 1/2).
Answer for Blank 1:
A:?????
Question 45 (Fill-In-The-Blank Worth 1 points)
A card is drawn at random from the cards shown below. Find the probability of drawing the letter M. P(M) = _______. Write your answer in fraction form (i.e., 1/2).
Answer for Blank 1:
A:2/11
Question 46 (Multiple Choice Worth 1 points)
What does it mean when a data set contains an outlier?
Someone broke the law.
The data is incorrect.
The data is corrupt and cannot be trusted.
The data contains an unusual & inconsistent amount.
A:The data contains an unusual and inconsistent amount
Question 47 (Multiple Choice Worth 1 points)
A random sample of 150 people are asked if they like liver and onions, and 57 of them say yes. What would you estimate the percentage of liver lovers are in this population?
57%
38%
50%
65%
A:57%
Question 48 (Fill-In-The-Blank Worth 1 points)
A math teacher gave her class two tests. 25% of the class passed both tests and 42% of the class passed the first test. What percent of those who passed the first test also passed the second test?
Answer for Blank 1:
A:??????
Question 49 (Fill-In-The-Blank Worth 1 points)
The probability that it is Friday and that a student is absent is 0.03. Since there are 5 school days in a week, the probability that it is Friday is 0.2. What is the probability that a student is absent given that today is Friday?
Answer for Blank 1:
A:.03
Question 50 (Multiple Choice Worth 1 points)
There are two types of ice cream cones - strawberry and peach. You and 24 of your closest friends are going to buy ice cream cones. If 15 people buy strawberry cones and 20 people buy peach cones, how many people bought both strawberry and peach cones?
No less than 25 people
10 people
No less than 10 people, no more than 15 people
15 people
Power Egg
Member Lvl: 10
Egg Points: 81487
Posts: 4443
Posted: Jun 12, 2008 9:16 a.m. - Subject:
6- 5/12 6.2 5.3 4.4 3.5 2.6
8- 1/2? idk i dont know what you mean
9-what grade are you in? randy
10-20.4
11 20
12 15
13 20
14 i dont see no graph
1512
6 cbf
17 graph
18 F
19 ** 1/8 i say
20- 4/36
21 *** 1/36 nub
22- yus
23 same
24 wat?
25 f
26 0.15
27 tru
28 25%
29 cbf
30
44 show the damn image
48 10.5 there’s a way for this, but i forgot so:
25% = 1/4 42/4=x
'The Overlord' Egg Moderator
Member Lvl: 77
Egg Points: 953450
Posts: 6254
Posted: Jun 12, 2008 5:38 p.m. - Subject:
I see quite a few issues. I think you’re a bit confused between dependent and independent probability. For example, the three coins. Each coin is independent of the other coins so calculating the total possibilities would be 2*2*2=8 and there is only one combo that I can find where all three come up heads so the odds of all three coming up heads is 1/8.
Same thing with the dice. The total number of possibilities is 6faces*6faces=36. So now you have to do what Garlock did where he figured out how many ways two dice can equal 8. As in 6.2, 5.3,4.4,3.5,2.6 so that is 5 ways out of 36 possibilities = 5/36.
Question 8 is a "trick" question... first you calculate the odds of "no heads" which really means "all tails". As I stated above the odds are 2*2*2=8 possibilities of which only one way can all tails come up so 1/8. That means for every 8 tosses it should come up 1 time. They’re asking if you toss it 1,000 times, how many times do you think it will come up... so 1,000/8=125. Out of 1,000 tosses, "no heads" or "all tails" should come up 125 times.
You need to look up the definition of "median".
Anyway, there are a lot of issues, so redo it with what I just told you and I’ll check it again. CBF to do all of them.
