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Chapter 7: Q.27 (page 429)
In order for the sums of distribution to approach a normal distribution, what must be true?
The sample size,gets larger.
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Find the probability that the sum of the values is greater than.
The mean number of minutes for app engagement by a table use is minutes. Suppose the standard deviation is one minute. Take a sample size of .
a. What is the probability that the sum of the sample is between seven hours and ten hours? What does this mean in context of the problem?
b. Find the and percentiles for the sum of the sample. Interpret these values in context.
A manufacturer produces -pound lifting weights. The lowest actual weight is pounds, and the highest is pounds. Each weight is equally likely so the distribution of weights is uniform. A sample of weights is taken.
Find the percentile for the mean weight for the weights.
A uniform distribution has a minimum of six and a maximum of ten. A sample of is taken.
Find the first quartile for the sums.
What is the mean, standard deviation, and sample size?
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