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g100num [7]
4 years ago
13

The grade-point average in an econometrics examination was normally distributed with a mean of 75. In a sample of 10 percent of

students it was found that the grade-point average was greater than 80. Can you tell what the s.d. of the grade-point average was?
Mathematics
1 answer:
never [62]4 years ago
3 0

To solve a standard deviation we require a specific result for each data. So this question(data from question) can not be enough to solve standard deviation.

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16. Jerome is a co-owner of a small company and received 1/3 of the company’s profits this year. What were the company’s overall
AlekseyPX
Remark
The trick to this question is realizing what you took 1/3 of. Did you take it of the 150000 or is it 1/3 of some total you have to find. I don't think you could come up with a third choice. 

It turns out that the answer is 1/3 of a number you don't know.

Equation
(1/3) x = 150000 Multiply both sides by 3
3*(1/3) x = 150000 * 3
x = 150000 * 3
x = 450000

Conclusion
The amount the company makes is 450000 dollars / year.
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