What percent of the data fall within standard deviations

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In any normal distribution, what percent of the data fall within 1.5 standard deviations of the mean?

The time it takes to travel from home to campus is normally distributed with μ = 18 minutes and σ = 3 minutes. What is the probability the trip takes between 15 and 20 minutes? 8) Random samples of size 64 are taken from an infinite population whose mean and standard deviation are 240 and 16, respectively. The distribution of the population is unknown. What are the mean and the standard error of the mean?

Suppose you have just taken a sample of size 64 from the population described in (8). What is the probability that the sample mean will be above 245?

A population has a mean of 300 and a standard deviation of 12. A sample of 64 observations will be taken. What is the probability that the sample mean will be between 295 to 305?

Reference no: EM132464908

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