Solve the problem.
-The monthly incomes of trainees at a local factory are normally distributed with a mean of $1600 and a standard deviation $150. What percentage of trainees earn less than $1390 a month?
A)8.08%
B)91.92%
C)1.40%
D)44.04%

Question

Quizplus · Accepted Answer

To find the percentage of trainees earning less than $1390, we calculate the Z-score: $Z = \frac{1390 - 1600}{150} = -1.4$. Looking up -1.4 on the Z-table gives us approximately 0.0808 or 8.08%.

Solve the Problem. -The Monthly Incomes of Trainees at a Local Factory Are