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- ?Lv 72 years agoFavorite Answer
z = ( x - µ )/σ
x = µ + zσ
p = 2.5% = 0.025 ===> z = -1.96
p = 95% + 2.5% = 0.975 ===> z = 1.96
Lower end: x = 65 + (-1.96)(8) = 49.32
Upper end: x = 65 + (1.96)(8) = 80.68
57, 70 and 80
- DylanLv 62 years ago
The normal range is 2.8 standard deviations from the mean (find 2.5% on Z-table)
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