1. The average Pag-ibig salary loan for RFS Pharmacy, Inc. employees is ₱13,000. If the debt is normally distributed with a standard deviation of ₱3,500, find the probability that the employee owes less than ₱16,500.
Solution:
Step 1: Draw a figure and represent the area.
Step 2: Find the z value.
Step 3: Find the appropriate area.
Let X be a random variable that represetns the salary. Then "X ~ N(13000, 3500^2)"
Step 1:
Step 2: "P(N(13000, 3500^2)<16500)=P(13000+3500Z<16500)=P(Z<1)=0.84134"
Step 3: There is 0.8413 probability that a random employee earn less than ₱16,500
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