mean deviation

Question

Suppose that travel times for Swinburne students are normally distributed with mean of 32.5 minutes and a standard deviation of 5.0 minutes. Complete the following sentence, giving figures correct to 1 decimal place, for example, 45.6

95% of travel times would fall between ___________ minutes and ________ minutes. Do not add any spaces before or after entering figures.

Answer 1

95% confidence interval for normal distribution is

 

mean + - 2std dev

 

32.5 + 2(5) = 42.5 min 

32.5 - 2(5)  = 22.5 min