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Chapter 6: Q 52 (page 387)
Find the 80th percentile.
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The golf scores for a school team were normally distributed with a mean of and a standard deviation of three. Find the probability that a randomly selected golfer scored less than .
齿词狈(鈥�)
What is the median?
We flip a coin \(100\) times \((n = 100)\) and note that it only comes up heads \(20% (p = 0.20)\) of the time. The mean and standard deviation for the number of times the coin lands on heads is \(\mu=20\) and \(\sigma=4\) (verify the mean and standard deviation). Solve the following:
a. There is about a \(68%\) chance that the number of heads will be somewhere between ___ and ___.
b. There is about a ____chance that the number of heads will be somewhere between \(12\) and \(28\).
c. There is about a ____ chance that the number of heads will be somewhere between eight and \(32\).
The length of time it takes to find a parking space at 9 A.M. follows a normal distribution with a mean of five minutes and a standard deviation of two minutes.
Seventy percent of the time, it takes more than how many minutes to find a parking space?
a. 1.24
b. 2.41
c. 3.95
d. 6.05
Thuy Dau, Ngoc Bui, Sam Su, and Lan Voung conducted a survey as to how long customers at Lucky claimed to wait in the checkout line until their turn. Let \(X=\) time in line. Table below displays the ordered real data (in minutes):
a. Calculate the sample mean and the sample standard deviation.
b. Construct a histogram.
c. Draw a smooth curve through the midpoints of the tops of the bars.
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