math 100

Suppose that people's heights (in centimeters) are normally distributed, with a mean of 170 and a standard deviation of 5. We find the heights of 70 people. (You may need to use the standard normal distribution table. Round your answers to the nearest whole number.)
(a) How many would you expect to be between 170 and 175 cm tall?

people

(b) How many would you expect to be taller than 179 cm?

people

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  1. Z = (score-mean)/SD = (175-170)/5 = 1

    (a) Z = 1, Consulting normal distribution table in you stat text, 34% of 70 = ?

    Do the same for (b).

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