大家好，想请问大家会如何解这题？
The heights of 5000 students at a local college have a mean of 155.0
centimeters and a standard deviation of 7.5 centimeters. What is the
height, in centimeters, that is 1.4 standard deviations above the mean?
这题我实在是有点有看没有懂，所以他的意思是标准差提高为8.9的话标准差会如
何变化吗？谢谢大家