# Question: The total energy need during pregnancy is normally distributed with

The total energy need during pregnancy is normally distributed, with mean µ = 2600 kcal/day and standard deviation σ = 50 kcal/day.

(a) What is the probability that a randomly selected pregnant woman has an energy need of more than 2625 kcal/day? Is this result unusual?

(b) Describe the sampling distribution of x̄, the sample mean daily energy requirement for a random sample of 20 pregnant women.

(c) What is the probability that a random sample of 20 pregnant women has a mean energy need of more than 2625 kcal/day? Is this result unusual?

(a) What is the probability that a randomly selected pregnant woman has an energy need of more than 2625 kcal/day? Is this result unusual?

(b) Describe the sampling distribution of x̄, the sample mean daily energy requirement for a random sample of 20 pregnant women.

(c) What is the probability that a random sample of 20 pregnant women has a mean energy need of more than 2625 kcal/day? Is this result unusual?

## Answer to relevant Questions

A machine at K&A Tube & Manufacturing Company produces a certain copper tubing component in a refrigeration unit. The tubing components produced by the manufacturer have a mean diameter of 0.75 inch with a standard deviation ...If a random sample of 36 is obtained from a population with mean 50 and standard deviation 24, what is the mean and standard deviation of the sampling distribution of the sample mean? A simple random sample of size n = 40 is obtained from a population with µ = 50 and σ = 4. Does the population need to be normally distributed for the sampling distribution of x to be approximately normally distributed? ...A simple random sample of size n = 36 is obtained from a population with µ = 64 and σ = 18. (a) Describe the sampling distribution of x̄. (b) What is P(x̄ < 62.6)? (c) What is P(x̄ ≥ 68.7)? (d) What is P(59.8 < x̄ < ...The shape of the distribution of the time required to get an oil change at a 10-minute oil-change facility is unknown. However, records indicate that the mean time for an oil change is 11.4 minutes, and the standard ...Post your question