Umi's test grades for this semester are in the list shown. The mean of her test grades is 82.4. 86, 93, 90, 85, 42, 91, 90
If the lowest test grade is eliminated, which statement about the new mean is true?
A. The new mean will be lower by about 40.

B. The new mean will be lower by about 7.
C. The new mean will stay about the same.
D. The new mean will be higher by about 7.
E. The new mean will be higher by about 40.

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?