Chapter 7: Q 46 (page 429)
46. Draw the graph from Exercise 7.45
Short Answer
The graph from Exercise 7.45 is given below:
Chapter 7: Q 46 (page 429)
46. Draw the graph from Exercise 7.45
The graph from Exercise 7.45 is given below:
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Get started for free7.7 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.
Find the probability that the sum of the values is less than .
Find the percentage of sums betweenstandard deviations below the mean of the sums and one standard deviation above the mean of the sums.
Your company has a contract to perform preventive maintenance on thousands of air-conditioners in a large city. Based on service records from previous years, the time that a technician spends servicing a unit averages one hour with a standard deviation of one hour. In the coming week, your company will serve a simple random sample of 70 units in the city. You plan to budget an average of 1.1 hours per technician to complete the work. Will this be enough time?
The length of time a particular smartphone's battery lasts
follows an exponential distribution with a mean of ten months. A sample of 64 of these smartphones is taken.
a. What is the standard deviation?
b. What is the parameter m ?
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