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Chapter 7: Q.24 (page 429)
What is ?
The value of.
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An unknown distribution has a mean of and a standard deviation of . A sample size of is drawn randomly from the population.
Find the probability that the sum of the values is less than .
Four friends, Janice, Barbara, Kathy and Roberta, decided to carpool together to get to school. Each day the driver would be chosen by randomly selecting one of the four names. They carpool to school for days. Use the normal approximation to the binomial to calculate the following probabilities. Round the standard deviation to four decimal places.
a. Find the probability that Janice is the driver at mostdays.
b. Find the probability that Roberta is the driver more than days.
c. Find the probability that Barbara drives exactly of those days.
A uniform distribution has a minimum of six and a maximum of ten. A sample of is taken.
Find the th percentile for the sums.
a.
b.
c.
d.
What is the standard deviation of ?
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