The number of red blood cells per square unit visible under a microscope follows a Poisson distribution with mean 4. Find the probability that more than 5 such blood cells are visible to the observer. What is the standard deviation of the number of red blood cells per square unit?

The annual snowfall in a town has a mean of 38 inches and a standard deviation of 10 inches. last year there were 63 inches of snow. find the number of standard deviations from the mean that is, rounded to two decimal places. 0.44 standard deviations below the mean 2.50 standard deviations below the mean 0.44 standard deviations above the mean 2.50 standard deviations above the mean