1.     Let X have a normal distribution with mean µ= 30 and...

1.     Let X have a normal distribution with mean µ= 30 and standard deviation σ= 10. Calculate P(X>40). Round to two decimal places. (4 pts)

2.    For a standard normal variable Z, compute P(Z<1.5). Round your answer to two decimal places. (3 pts)

10. A larger standard deviation of a normal distribution indicates that the distribution becomes (2.5 pts)

a.    narrower and more peaked

b.    flatted and wider

c.    more skewed to the right

d.    more skewed to the left