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The scores on an exam are posted and the mean is 75 with a standard deviation of 5. Assuming the scores follow a normal-shaped distribution, use the 68-95-99.7 rule to determine each of the following:
Ted scored an 80, what percent of students scored higher than Ted?
What percent of students scored between 60 and 90?
If 70 is passing, what percent of the students passed an exam?
This confidence interval can't be trusted to give information about the spending plans of all adults. Why not?
Smith is a weld inspector at a shipyard. He knows from keeping track of good and substandard welds that for the afternoon shift 5% of all welds done.
Explain the scientific and technical concepts related to nuclear medicine. Consider the following questions when you construct your response:
What is the probability you will win any money in the state lottery and the probability that you will win at least $100
Find the sample mean and sample standard deviation of the amount citizens spend per year. When finding a confidence interval for the true mean spent of ALL citizens, should we use a z-score or a t-score? Why?
jeffs bowling scores are approximately normally distributed with mean 160 and standard deviation 13 while jacks scores
In order to monitor the ecological health of the Florida Everglades, various measurements are recorded at different times. The bottom temperatures are recorded at the Garfield Bight station
When one of the five predictor variables in the preceding example is elimi- nated from the analysis, the value of R2 drops from 0.75 to 0.71. What does this tell us about the variable that was dropped?
Determine the likelihood of accepting a lot which is 1% defective?
The ages of the cadets in the sample will form a normal distribution.
assume that the mean hourly cost to operate a commercial airplane follows the normal distribution with a mean of 2275
i have two questions i need help with. please show me how to obtain the answers. they are in the attachment. thank
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