1. What is the class width for the frequency distribution of a data set with the high data value of 625, a low data value of 52, and 10 classes?

You were told that the amount of time lapsed between consecutive trades on the new york stock exchange followed a normal distribution with a mean of 15 seconds. you were also told that the probability that the time lapsed between two consecutive trades to fall between 16 to 17 seconds was 13%. the probability that the time lapsed between two consecutive trades would fall below 13 seconds was 7%. what is the probability that the time lapsed between two consecutive trades will be between 14 and 15 seconds?

How can (square root of 25) ^2 be rewritten?

The anwser cause i do not understand just plez