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According to a survey, only 15% of customers who visited the web site of a major retail store made a purchase. Random samples of size 50 are selected.



a) What proportion of the samples will have less than 15% of customers who will make a purchase after visiting the web site?

a)

______________



b) What proportion of the samples will have between 20% and 30% of customers who will make a purchase after visiting the web site?

b)

______________



c) The standard deviation of all the sample proportions of customers who will make a purchase after visiting the web site is ________.

c)

______________



d) The average of all the sample proportions of customers who will make a purchase after visiting the web site is ________.

d)

______________



e) 90% of the samples will have more than what percentage of customers who will make a purchase after visiting the web site?

e)

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