Assume that the random variable x is normally distributed, with mean ? = 50 and standard deviation ? = 7. compute the following probabilities. be sure to draw a normal curve with the area corresponding to the probability shaded.

p(56 < x < 68)

b- find the value of za.

z 0.02

c-assume that the random variable x is normally distributed, with mean ? = 50 and standard deviation ? = 7. find each indicated percentile for x.

the 90th percentile

d-the graph of a normal curve is given. use the graph to identify the values of ? and ? .