Expected Values and Standard Deviation
Authored by Anthony Clark
Mathematics
11th Grade
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15 questions
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1.
FILL IN THE BLANKS QUESTION
1 min • 1 pt
A normally distributed data set of 600 values has a mean of 18.5 and a standard deviation of 3.25.
What is the approximate number of values in the data set expected to be 22 or greater? Round to the nearest whole number AT THE END!
(a)
2.
FILL IN THE BLANKS QUESTION
1 min • 1 pt
A normally distributed data set of 600 values has a mean of 18.5 and a standard deviation of 3.25.
What is the approximate numbers of values in the data set expected to be 16 or fewer? Round to the nearest whole number AT THE END!
(a)
3.
FILL IN THE BLANKS QUESTION
1 min • 1 pt
A normally distributed data set of 600 values has a mean of 18.5 and a standard deviation of 3.25.
How many values lie between 21 and 27? Round to the nearest whole number AT THE END!
(a)
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
The volumes of soda in quart soda bottles can be described by a Normal model with a mean of 32.3 oz and a standard deviation of 1.2 oz. What percentage of bottles can we expect to have a volume less than 32 oz?
0.4013
0.2403
0.5204
0.1407
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A bank's loan officer rates applicants for credit. The ratings can be described by a Normal model with a mean of 200 and a standard deviation of 50. What percentage of ratings can be expected to be between 200 and 275?
0.4331
0.5671
0.3861
0.2987
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A town's average snowfall is 48 inches per year with a standard deviation of 6 inches. Using a Normal model, what values should border the middle 50% snowfalls?
44 and 52 inches
42 and 54 inches
40 and 50 inches
40 and 60 inches
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A standardized test has scores that can be described by a Normal model with a mean score was 100 points and a standard deviation of 10 points. What score is at the 25th percentile?
93.26
106.74
90.32
80
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