Hello - i asked the question before, but do not fully understand. Do you mind breaking it down? According to the stock index, the return from January 2014 to December 2014 shows the average of 7% with...

Hello - i asked the question before, but do not fully understand. Do you mind breaking it down?

According to the stock index, the return from January 2014 to December 2014 shows the average of 7% with standard deviation of 2.5%.

1) According to the Central Limit Theorem (CLT), what the sample mean distribution if we randomly pick 25 stocks?