Section 6.4 Homework

5.  The overhead reach distances of adult females are normally distributed with a mean of 195 cm and a standard deviation of 8.3 cm.

Find the probability that an individual distance is greater than 208.40 cm.

Find the probability that the mean for 20 randomly selected distances is greater than 193.20 cm.

Why can the normal distribution be used in part​ (b), even though the sample size does not exceed​ 30?

Choose the correct answer below.

1. The normal distribution can be used because the finite population correction factor is small.
2. The normal distribution can be used because the original population has a normal distribution.
3. The normal distribution can be used because the mean is large.
4. The normal distribution can be used because the probability is less than 0.5