Question

1.Assume that x has a normal distribution with the specified mean and standard deviation. Find the indicated probability. (Round your answer to four decimal places.) μ = 108; σ = 15 P(x ≥ 90) =

2.Assume that x has a normal distribution with the specified mean and standard deviation. Find the indicated probability. (Round your answer to four decimal places.) μ = 103;σ = 10 P(x ≥ 120) =

3.During the Computer Daze special promotion, a customer purchasing a computer and printer is given a choice of three free software packages. There are 10 different software packages from which to select. How many different groups of software packages can be selected?

4.Suppose X ~ N(2, 3). What value of x has a z-score of −0.72? (Enter an exact number as an integer, fraction, or decimal.) x =?

Answer 1

In Question -4 i gave two answers.

By changing of sigma value,take a look