1.Most values of a standard normal distribution are between (3 pts)

a.-3 and 3

b.0 and 1

c.0 and 3

d.1 and 3

2.a. If the standard deviation of a data set is 1.3, what is the variance? (2.5 pts)

b. If the variance is 36, what is the standard deviation? (2.5 pts)

3.Let X have a normal distribution with mean = 20 and standard deviation = 4.Determine the area in the normal curve for which:

a.P (X >28)(2.5pts)

b.P(X < 12)(2.5pts)

c.P(16