Mean = 74
S.D. = 7
P(60<x<80) to find
Z score at x = 60
Z = (X - μ) / σ
Z = (60 - 74) / 7
Z = -2
Z score at x = 80
Z = (X - μ) / σ
Z = (80 - 74) / 7
Z = 0.85714
P(60<x<80)
= P( -2 < X < 0.85714)
=P(X < 0.85714) - P(X< -2)
= 0.85714 - 0.0228
= 0.7816
P(60<x<80) = 0.7816
Question 4 Unanswered On a recent English test, the scores were normally distributed with a mean...
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