we have = 175 and = 7
(A) we have to find the percentage of mean between 168cm and 182 cm
using the formula
setting the values, x1 = 168, x2 = 182 and = 175 and = 7
we get
this gives
0.6826 or 0.6826*100 = 68.3
so, Required percentage is 68.3%
(B) we have to find the percentage of mean between 154cm and 296 cm
using the formula
setting the values, x1 = 154, x2 = 296 and = 175 and = 7
we get
this gives
this gives 0.9987 or 0.999*100 = 99.9%
so, Required percentage is 99.9%
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