Question

If the mean of a normal distribution ia 23 and the standard deviation is 4 wjat data value is 1.5 standard deviations below the mean

Answer 1

17
17.5
18.5
21.5

Answer 2

this is normal distribution

Answer 3

why you leave @dan815

Answer 4

One standard deviation is 4. Therefore 1.5 standard deviations is given by:
\[\large 4\times1.5=6\]
Now subtract 6 from 23 to get the required value.