suppose the heights of 10 year old boys vary according to a normal distribution with u =138 cm and standard deviation =7cm. what proportion of 10 year old boys is less than 140 cm in height?
Added by Marc B.
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Step 1: Calculate the z-score using the formula z = (x - mu) / sigma, where x = 140 cm, mu = 138 cm, and sigma = 7 cm. Show more…
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