According to a mashable post, time spent on tumblr, a microblogging platform and social networking website, has a mean of 14 minutes per visit. (source: on. mash. to/1757wfe.) as- sume that time spent on tumblr per visit is normally distributed and that the standard deviation is 4 minutes. if you select a random sample of 25 visits, a. what is the probability that the sample mean is between 13.6 and 14.4 minutes

Solution: We are given that the time spent on tumblr, a microblogging platform and social networking website is normally distributed with mean = 14 minutes and standard deviation = 4 minutes

We have to find, If we select a random sample of 25 visits,  the probability that the sample mean is between 13.6 and 14.4 minutes. In other words, we have to find:

First we have to find the z scores as:

Using the standard normal table, we have:

Therefore, if a random sample of 25 visits is selected, the probability that the sample mean is between 13.6 and 14.4 minutes is 0.3830

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step-by-step explanation:

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a line is an defined derm because it

a)contains an infinite number of points b) can be used to create other geometric shapes c)describes something that does not have width or depth d) is a term that does not have a formal definition. a line is an undefined term because it: contains an infinite number of points.