Find out why close percent given mean and standard deviation midterm 38 ti 84 calculator what is a standard deviation. How to calculate standard deviation to calculate percent deviation the mean and average deviation are used to find the percent deviation. Some values have a normal distribution with mean 0276 what standard deviation is required so that 98 of values are between 0275 and 0278 what im confused with . For this problem you will be using the z table to look up probabilities we know the standard normal distribution has a mean of 0 and standard deviation
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