Question

Suppose the time a child spends waiting for the bus at the school bus stop each day is exponentially distributed with a mean of 2 minutes. Suppose waiting times for the bus are independent each day. If we look at two days, determine the probability that the child must wait at most 5 minutes for the bus each of the two days.

	a.	0.9180
	b.	0.8426
	c.	0.0821
	d.	0.2821
	e.	0.4179

A sample of 33 boxes of cereal has a sample standard deviation of 0.81 ounces. Construct a 94% confidence interval to estimate the true standard deviation of the filling process for the boxes of cereal.

	a.	(0.534, 1.086)
	b.	(0.657, 1.059)
	c.	(0.432, 1.121)
	d.	(0.730, 0.730)

Answer 1

here 0.6569 can be rounded to 0.657

And 1.0588 can be rounded to 1.059

So correct option is :-

0.657 < <1.059

b) (0.657,1.059)