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An investigator polls common cold sufferers asking them to estimate the number of hours of physical...

An investigator polls common cold sufferers asking them to estimate the number of hours of physical discomfort caused by their most recent colds. Assume that their estimates approximate a normal curve with a mean of 83 hours and a standard deviation of 20 hours.

what proportion of the original survey suffered for exactly 61 hours?

what proportion suffered for fewer than 61 hours?

what us the estimated number of hours suffered by the extreme 1 percent either above or below the mean?

what proportion suffered for between 1 a d 3 days, that is between 24 and 72 hours?

what proportion of sufferers estimate that their colds lasted longer than 48 hours?

what is the estimated numbers of hours for the shortest suffering 5 percent?

Math   Statistics-And-Probability   
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