Solution :
Given that ,
mean = = 70.9
standard deviation = = 2.1
n = 36
= / n = 2.1 / 36 = 0.35
P( > 71.9) = 1 - P( < 71.9)
= 1 - P[( - ) / < (71.9 - 70.9) / 0.35]
= 1 - P(z < 2.8571)
= 1 - 0.9979
= 0.0021
Probability = 0.0021
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