If the mean of a set of numbers is 13.5 and its standard deviation is 1.5 . What is the value which is 2 standard deviations away from the mean ?

arnabgangully Wrote:There can be multiple values for the answer because the relation between SD and Mean is quadratic in nature

Could u please elaborate the possible solutions n explanation . The options were given as
A) 10.5
B) 11.5
C) 14.5
D) 15

The list shown consists of the times, in seconds,that it took each of 10 school children to run a distance of 400 meters. If the standard deviation of the running times is 22.4,rounded to the nearest tenth of a second,how many of the 10 running times are more than 1 standard deviation below the mean...

In a certain bathtub,both the cold-water and the hot-water fixtures leak . The cold-water leak alone would fill an empty bucket in "c" hours,and the hot-water leak alone would fill the same bucket in "h" hours,where c<h.If both the fixtures began to leak at the same time into ...

Five pieces of wood have an average (arithmetic mean) length of 124 centimeters and a median length of 140 centimeters.What is the maximum possible length ,in centimeters,of the shortest piece of wood ?

A) 90
B) 100
C) 110
D) 130
E) 140

The list shown consists of the times, in seconds,that it took each of 10 school children to run a distance of 400 meters. If the standard deviation of the running times is 22.4,rounded to the nearest tenth of a second,how many of the 10 running times are more than 1 standard deviation below the mea...