Need ASAP Problem STAT

I need ASAP In the document, there are 20 multiple choice questions from Probability & Statistics. I just need the answers, no work at all. Thank you.
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QUESTION 1
1. Which variable is discrete?
number of runners in race
length of race in kilometers
time to finish a race
temperature at start of race
5 points
1.
QUESTION 2
Which best describes the distribution of the data in the line plot?
skewed right
bell-shaped
uniform
skewed left
5 points
QUESTION 3
1.
The frequency histogram shows the lengths of trails in a large park.
How many trails are less than 6 kilometers long or at least 24 kilometers long?
13
16
8
9
5 points
1.
QUESTION 4
A camping leader bought the items listed in the table for his team.
What is the average cost of an item in his purchase?
$6.25
$5.58
$5.75
$6.95
5 points
1.
QUESTION 5
Which is the approximate standard deviation of the data set?
{5, 12, 15, 10, 12, 6, 8, 8}
4.8
3.4
5.0
3.9
5 points
QUESTION 6
1. An art gallery has 12 vases. How many ways can 5 of the vases be arranged in the display
window?
95,040
2520
792
665,280
5 points
1.
QUESTION 7
The table shows the different types of shoes available at a family shoe store.
What is the probability that a randomly chosen women’s shoe is a casual shoe?
about 48.6%
about 24.8%
about 32.9%
about 51.5%
5 points
1.
QUESTION 8
Fifty balls are numbered 1â??50 and a red dot is painted on those balls that are a multiple of 7. The balls are
mixed into a bag and one ball is randomly chosen. What is the probability that the ball is numbered with a
multiple of 5 or has a red dot?
5 points
QUESTION 9
1. A bowl has 9 green grapes and 13 red grapes. Henry randomly chooses a grape, eats it, and
then chooses another grape. What is the probability that both grapes are green?
about 15.6%
about 16.7%
about 14.9%
about 17.5%
5 points
1.
QUESTION 10
Determine the expected value of X.
4.8
5.45
4.6
5.95
5 points
QUESTION 11
1. Scores on a standardized test are normally distributed with a mean of 258 and a standard
deviation of 24. Students who score at least 2.3 standard deviations above the mean receive
a certificate. What is the minimum score required to receive the certificate?
285.0
313.2
306.0
282.7
5 points
QUESTION 12
1. The weights of books on a library shelf are normally distributed with a mean of 3.1 pounds
and a standard deviation of 0.8 pound. Approximately what percent of the books weigh
more than 3.5 pounds?
12%
23%
19%
31%
5 points
1.
QUESTION 13
Mrs. Fuller determines which four members of a population, labeled 01â??48, will be in a sample by starting at
line 147. Which members are in the sample?
20, 01, 12, 45
01, 12, 45, 18
11, 24, 01, 12
01, 24, 12, 33
5 points
1.
QUESTION 14
Jackie received 72% of the votes in an election. In a random sample of 40 eligible voters, 32 said they voted
for Jackie.
5 points
QUESTION 15
1. Study results indicate that the mean time to download a certain program to a personal
computer is between 35.4 and 42.6 seconds. What is the study’s margin of error?
3.6 s
7.2 s
5.2 s
2.6 s
5 points
QUESTION 16
1. If movie theater tickets in a region have a mean cost of $8.32 and a standard deviation of
$0.76, what is the approximate standard deviation of the sampling distribution of the mean
for samples of size 30?
$0.14
$0.09
$0.28
$0.03
5 points
QUESTION 17
1. In a random sample of 40 people who rode a roller coaster one day, the mean wait time is
52.4 minutes with a standard deviation of 9.5 minutes. In a random sample of 50 people
who rode a Ferris wheel the same day, the mean wait time is 14.1 minutes with a standard
deviation of 2.3 minutes. Construct a 99% confidence interval for the difference between
the mean wait times of everyone who rode both rides.
(35.8, 40.8)
(36.8, 39.8)
(34.3, 42.3)
(36.9, 40.7)
5 points
QUESTION 18
1. In a simple random sample of 80 patients who saw a certain dentist, 9 patients had their
teeth whitened. What is the 95% confidence interval for the percent of all the dentist’s
patients who had their teeth whitened?
(4.4, 18.2)
(8.4, 14.2)
(7.8, 14.8)
(5.5, 17.1)
5 points
1.
QUESTION 19
Which phrase is the best description of the association between variables X and Y?
strong negative association
moderate negative association
strong positive association
moderate positive association
5 points
1.
QUESTION 20
Which is the best estimate of the residual when x = 3?
â??0.5
2.5
0.5
â??2.5
5 points
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