The manager of a bank recorded the amount of time each customer spent waiting in line during peak business hours one monday. the frequency distribution below summarizes the results. find the standard deviation. round your answer to one decimal place.

38+105= 143, 39+104=143, and you will find then adding the numbers on opposite sides, moving inwards yields the answer 138 every time. because of this, you’re going to multiply 138 times the number of pairs, which is 34. therefore, 34*138= 4692(i’m sorry if it’s the wrong numbers, but it’s the right concept)