A set has an average (arithmetic mean) of 42 and a standard deviation of 1.8. Which of the following values is two standard deviations away from the mean?	Choose the correct choice from the following options.
A) 36	B) 38.4	C) 40.2	D) 43.8	E) 75.6
AM is 42 and SD is 1.8...   Now, we need to count all numbers greater than 42+2(1.8) = 45.6 or 42-2(1.8) = 38.4 (we are asked to find the value that is two SD away from the mean..so multiply the SD by 2)   Only B is in the list..   Answer: option 38.4 is correct answer..
<result>B</result>
A set has an average (arithmetic mean) of 42 and a standard deviation of 1.8. Which of the following values is two standard deviations away from the mean?