Suppose the average grade in this class is 85 with standard deviation 2.50. a) If each...

Question

Question

Suppose the average grade in this class is 85 with standard deviation 2.50.

a) If each grade is increased by 5 points, what are the new mean and standard deviation?

b) If each grade is increased by 5%, what are the new mean and standard deviation?

Answer 1

Answer #1

a)Mean will increase by 5 and standard deviation will remain same , or mean = 90, standard deviation = 2.5

b) Mean will increase by 5% and standard deviaion will also increase by 5% .

Mean = 85*1.05=89.25

Standard deviation = 2.5*1.05 = 2.625

Answer 2

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