Help with Statistic Question16B

Algebra
Tutor: None Selected Time limit: 1 Day

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 90 people. (Round answer to nearest whole number.)

how many people would you expect taller than 176 cm?

Dec 5th, 2014

z=(176-170)/5=6/5=1.2

According to standard distribution table, the probability of z<1.2 is 0.8849.

Therefore the probability of a people taller than 176cm is 1-0.8849=0.1151

90x0.1151~10

So we would expect 10 people taller than 176cm.

Dec 5th, 2014

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