Question

A quart of milk contains a mean of 35 g of butterfat, with a standard deviation of 4 g. If the butterfat is normally distributed, find the probability that a quart of this brand of milk chosen at random will contain the following. (Round your answers to four decimal places.)

(a) between 35 and 39 g of butterfat


(b) between 25 and 35 g of butterfat

The heights of a certain species of plant are normally distributed, with mean μ = 23 cm and standard deviation σ = 4 cm. What is the probability that a plant chosen at random will be between 17 and 29 cm tall? (Round your answer to four decimal places.)

Suppose a population of scores x is normally distributed with μ = 60 and σ = 10. Use the standard normal distribution to find the probability indicated. (Round your answer to four decimal places.)

Pr(55 ≤ x ≤ 65)

Answer 1