On a test that has normal distribution of scores, a score of 58 falls two standard deviation below the mean, and a score of 85 is one standard deviation above the mean. What is the mean score of this test?

On a test that has a normal distribution of scores of 59 falls two standard deviations below the mean, and score of 74 is one standard deviation above the mean. If x is an integer score that lies between 2.5 and 3.0 standard deviations above the means. What is a possible value of x?

The class mean score on a test was 60, and the standard deviation was 15. If Elena's score was within 2 standard deviations of the mean, what is the lowest score she could have received?

The standard deviation of a poisson distribution is 4 then its mean is

Calculate the mean, variance and standard deviation for the following distribution.

Calculate the mean and standard deviation of the distribution :

Calculate the mean and standard deviation of the distribution :

Calculate the mean and standard deviation of the distribution :

Calculate the mean and standard deviation of the distribution :

Calculate the mean and standard deviation of the distribution :