Heights of 10-year-old boys. Weve established that heights of 10- year-old boys vary according to a Normal

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Heights of 10-year-old boys. We’ve established that heights of 10-

year-old boys vary according to a Normal distribution with μ =138 cm and σ = 7 cm.

(a) What proportion of this population is less than 150 cm tall?

(b) What proportion is less than 140 cm in height?

(c) What proportion is between 150 and 140 cm?

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