Normal Distribution
2 years ago
sherieastman
Save
Edit
Host a game
Live GameLive
Homework
Solo Practice
Practice
• Question 1
120 seconds
Q. In a survey of men in the United States (ages 20-29), the mean height was 69.6 inches with a standard deviation of 3.0 inches. Find the minimum height in the top 22%.
69.37 in
67.58 in
73.12 in
• Question 2
300 seconds
Q. The 40 yards sprint times for a soccer team are found to be normally distributed with a mean of 5.2 seconds and a standard deviation of 0.3 seconds.  What is the z-score for a player who runs a time of 5.6 seconds?
-1.33
1.33
0.88
1.02
• Question 3
300 seconds
Q. The 40 yards sprint times for a soccer team are found to be normally distributed with a mean of 5.2 seconds and a standard deviation of 0.3 seconds.  What is the z-score for a player who runs a time of 4.6 seconds?
0.83
1.07
-2
-1.07
• Question 4
300 seconds
Q. The mean number of accidents a week at a company is 6.4 with a standard deviation of 1.5.  What proportion of weeks would you expect to have less than 5 accidents?
0.6915
0.1762
0.8238
-0.93
• Question 5
300 seconds
Q. The mean number of accidents a week at a company is 6.4 with a standard deviation of 1.5.  What proportion of weeks would you expect to have more than 7 accidents?
0.3446
0.2856
0.4
0.6554
• Question 6
300 seconds
Q. The mean GPA of students in a course at UCDavis is 3.2 with a standard deviation of 0.3. What percent of students in the course have a GPA between  2.9 and 3.8?
81.5%
47.5%
68%
95%
• Question 7
300 seconds
Q. Between what two standard deviations of a normal distribution contain 68% of the data?
one below and one above
two below and two above
two below and zero
zero and two above
• Question 8
300 seconds
Q. The average waist size for teenage males is 29 inches with a standard deviation of 1.4 inch.
If waist sizes are normally distributed, estimate the proportion of teenagers who will have waist   sizes greater than 31 inches?
92.4%
10.5%
16%
7.6%
• Question 9
300 seconds
Q. The scoring of modern IQ is such that Intelligence Quotients (IQs) have a normal distribution of μ= 100 and 𝞂 = 15.

Mensa International is a non-profit organization that accepts only people with IQ score within the top 2%. What level of IQ qualifies one to be a member of Mensa?
115
130.75
145
120
• Question 10
300 seconds
Q. What is the the total area under the standard normal distribution curve?
100
25
.5
1
• Question 11
300 seconds
Q. μ = 70 , σ = 8 , X = 50 . Find z score
2.5
-2.5
5.2
-5.2
• Question 12
300 seconds
Q. The z-score represents.....
the amount of standard deviations a data value is above or below the mean.
the percentile the data value is above or below the mean.
the amount of standard deviations a data value is above or below the median.
the percent the data value is above or below the mean.
• Question 13
300 seconds
Q. The distances male long jumpers for State College jump are approximately normal with a mean of 263 inches and a standard deviation of 14 inches.
Suppose a male long jumper's jump ranked in the 75th percentile.  How long was his jump?
0.67 inch
263 inches
272.44 inches
277.25 inches
• Question 14
60 seconds
Q. What is the the total area under the standard normal distribution curve?
100
25
.5
1
• Question 15
45 seconds
Q. The shelf life of a particular dairy product is normally distributed with a mean of 12 days and a standard deviation of 3 days.

About what percent of the products last between 12 and 15 days?
68%
34%
16%
2.5%
• Question 16
30 seconds
Q. Which is NOT true about the standard normal distribution?