Mean = 9.32 Standard Deviation = 1.71 for boys
Mean = 10.04 Standard Deviation =1.83 for girls
What percent of Boys score above 11?
What percent of Girls score above 11?
What percent of Boys score below 8?
What percent of Girls score below 8?
Mean = 9.32 Standard Deviation = 1.71 for boys
Mean = 10.04 Standard Deviation =1.83 for girls
What percent of Boys score above 11?
What percent of Girls score above 11?
What percent of Boys score below 8?
What percent of Girls score below 8?
SDS give us some more info...
If your mean and standard deviation is the score for an exam..or whatever and the Variable X is normally distributed then you have to standardize it and check from the tables to find the propabilities ...i.e P(Z>11) or P(z<8) etc..... when you get the probabilities multiply them by 100 to get the percentage.....