107 = µ-1σ
135 = µ+1σ
So, what % is within 1σ of µ? Your Z table says 68.27% of 400 or 273
Treat the other numbers similarly
In a set of 400 values, the mean is 121 and the standard deviation is 14. Estimate how many values fall in between each interval?
a) 107 - 135
b)93 - 149
c) 79 - 163
1 answer
1 answer