Question

1. What is the mean of a binomial distribution with n = 8 trials and p = 0.15?

2. The area under a normal curve represents the:

probability of an event occurring

Z-score

standard deviation

mean

3.

A manufacturing process outputs parts having a normal distribution with a mean of 30 cm and standard deviation of 2 cm. From a production sample of 80 parts, what proportion of the sample can be expected to fall between 28 and 32 cm? (ref Activity 7.16)

  

90%

68%   

50%

95%

Answer 1

1)

mean = np
= 8 * 0.15 = 1.20

2)

The area under a normal curve represents the:

probability of an event occurring

3)
As per empirical rule, ~68% of data lies within 1-std. dev.

68%