Question

In a sample of 1000 cases, the mean of a certain test is 14 and standard deviation is 2.5 assuming the distribution to be normal, how many students score between 12 and 15

Answer 1

Answer:

$mean = > \frac{sum \: of \: values \: }{total \: number \: of \: values \: } \\ 14 = > \frac{x}{1000} . \\ 14 \times 1000 = > x. \\ 14000 = > x. \\ as \: sum \: of \: values \: is \: 14000 \: \\ hopes \: its \: help \: u \: mark \: it \: as \: a \: \\ brainlist \: answer \: . \:$