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In: Statistics and Probability

Q5. I recorded the annual salaries of 300 employees of a chain computer stores. The mean...

Q5. I recorded the annual salaries of 300 employees of a chain computer stores. The mean and standard deviation are $28,000 and $3,000. If the data show a bell-shaped curve,

a) how many employees receive salaries between $25,000 and $31,000?

Answer: 300 x (            ) = (            ) employees.

b) how many employees receive salaries between 22,000 and 34,000?

Answer: 300 x (            ) = (            ) employees.

c) how many between 37,000 and 19,000?

Answer: 300 x (            ) = (            ) employees.

Q7. I recorded the annual salaries of the employees of a chain computer stores. The mean and standard deviation are $38,000 and $3,000. If the data show a bell-shaped curve, 95% of the employees receive salaries between (           ) and (            ).

Q8. I took the midterm last week and the professor told me only the average score (=80) and the standard deviation (=4). Since there are about 4-5 students who never show up in class, I would assume that the score distribution is NOT bell-shaped. Given that we have 30 students in this class, at least how many students scored between 72 and 88?

Answer: At least 30 x (            ) = At least (            ) firms

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orchestra answered 1 year ago
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