A headline in a certain newspaper states that “most stay at first job less than 2 years.” The headline is based on an online poll of 390 college graduates. Among those polled, 79% stayed at their first full-time job less than 2 years. Complete parts (a) through (d).
(a) The mean is ________ graduates
The standard deviation is ________
(b) Assuming that the 50% rate in part (a) is correct, find the range of usual values for the numbers of graduates among 390 who stay at their first job less than 2 years.

Question

A headline in a certain newspaper states that “most stay at first job less than 2 years.” The headline is based on an online poll of 390 college graduates. Among those polled, 79% stayed at their first full-time job less than 2 years. Complete parts (a) through (d).
(a)	The mean is  ________ graduates
The standard deviation is ________
(b)	Assuming that the 50% rate in part (a) is correct, find the range of usual values for the numbers of graduates among 390 who stay at their first job less than 2 years.