Question

1. The weights of 9 year old male children are normally distributed population with a mean of 73 pounds and a standard deviation of 12 pounds. Determine the probability that a random sample of 21 such children has an average less than 72 pounds.

Round to four decimal places.

2. A normally distributed population has a mean of 80 and a standard deviation of 17. Determine the probability that a random sample of size 26 has an average greater than 72.

Round to four decimal places.

3. A normally distributed population has a mean of 77 and a standard deviation of 18. Determine the probability that a random sample of size 35 has an average between 71 and 81.

Round to four decimal places.

Answer 1