An analyst working for a social media company has determined that the mean number of "friends" that users of the company's main service (a smartphone app) have is 190, with a standard deviation of 250. What is the probability that, in any random sample of 70 users, the mean number of friends those users have,Y, would be less than 150? Report your answer to four decimal places.

Hint: this is a sampling distribution problem.

Please help I have missed this one twice and only have one more try. thanks a lot

The Y has a colon on top of it.