Below is the graph of a normal distribution with mean = standard deviation o = 84 and 2.4

About what percentage of a normal distribution falls within 2.5 standard deviations of the mean?

the mean of a random sample of size n= 25 is used to estimate the mean of an entire population that has a standard deviation of 3.1 and mean 52. what is the 75th percentile average value

Yearly snow fall of a certain town follows a normal distribution with a mean of 37 inches and a standard deviation of 2.5 inches.  What is the z-score if in 2007 the snowfall was 40 inches?

The scores on a distribution have a normal distribution with mean 65. Suppose the third quartile corresponds to75. What is the standard deviation by z-score

What is the SD of a distribution if the mean is 4.5 and a z score of 3.5 corresponds to a raw score of 15?

What happens to the graph of the normal curve as the standard deviation​ decreases?

The annual per capita consumption of oranges (in pounds) in the United States  can be approximated by a normal distribution. The mean annual per capita  of oranges is 19.2 with a standard deviation of 4 pounds.  what annual per capita consumption of oranges represents the 5th percentile?

The sample mean X is to be used to estimate the mean u of a normal distribution with standard deviation 4 inches. How large a sample should be taken in order chat, with 90% probability, the estimate will be in error by at most one-half inch?

glucose levels in oatients free of diabetes are assumed to follow a normal distribution with a mean of 120 and a standard deviation of 16. What proportion of patients have glucose levels exceesing 115?