Question
2.The final marks for the Wednesday class in Statistics 101 are ready to be posted. The class average is 72%, with a standard deviation of
2.The final marks for the Wednesday class in Statistics 101 are ready to be posted. The class average is 72%, with a standard deviation of 9. The distribution of grades is approximately bell-shaped.
a. What percentage of the grades are above 81?
Percentage of grades%
b. What percentage of the grades are below 54? (Round the final answer to 1 decimal place.)
Percentage of grades%
c. What percentage of the grades are between 54 and 90?
Percentage of grades%
d. What percentage of the grades are between 54 and 81? (Round the final answer to 1 decimal place.)
Percentage of grades%
e. What percentage of the grades are between 54 and 99? (Round the final answer to 2 decimal places.)
Percentage of grades%
f. What percentage of the grades are less than 63 or more than 90? (Round the final answer to 1 decimal place.)
Percentage of grades%
3.Health issues are a concern of managers, especially as they evaluate the cost of medical insurance. A recent survey of 150 executives at Elvers Industries, a large insurance and financial firm, reported the number of kilograms by which the executives were overweight. Compute the range and the standard deviation. (Round the final answers to 2 decimal places.)
Number of Kilograms Frequency
0 to under 6 14
6 to under 12 42
12 to under 18 58
18 to under 24 28
24 to under 30 8
Range
Standard deviation
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