Originally Posted by
rensmom A random sample of 50 new mothers was asked to estimate how much they spent on prenatal care. The results are present in the frequency distribution presented below.
Amount spent on prenantal Care ($) Mothers (Number)
0-99 2
100-199 4
200-299 8
300-399 20
400-499 16
Total 50
Calculate the mean amount spent on prenatal care AND using the short cut formula to calculate the standard deviation of the amounts spent on prenatal care.
I got 229.5 for the mean but Im not sure if this is right, and the numbers im getting for standard deviation are all over the place.
any help would be really appreciated. thanks