Solution :
Given that ,
mean =
= 21
standard deviation =
=
= 2.65
P(12< x < 14) = P[(12-21 / 2.65) < (x -
) /
< (14-21) /2.65)]
P(12 < x < 14) = P(-3.3962 < z < -2.6415)
= P(z < -2.6415) - P(z < -3.3962)
= 0.0041 - 0.0003
Probability = 0.0038
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