Below is a situation and its step-by-step procedure in solving problems involving

the mean and variance of a discrete random variable, which is already answered

for you. Your job is to check for errors in each step of the solution. If there are

errors, do the following in the table after the test sample and write the answers on

a separate sheet of paper:

1. Identify the errors.

2. Correct the errors.

3. Then explain why your correction is right.

Step 3: Finding The Standard Deviation 0' = #520317 a 22.81 Identified Error Correction of Error Explanation of Correction ANSWERED TEST 1WITH ERRORS: Problem: Your father said that it your grade in Math is at least 90 in a grading quarter. he will add Php 50 to your daily allowance. Php 20 ii your grade is 30 - 89, but he will decrease it by Php 10 it your grade is 1'9 and below. It the probability of getting at least 90 is 12%, while you have a 45% chance to get 80 - 89. what is the standard deviation of your possible allowance per quarter? Solution: Step 1: Finding The Ilean p a em = z XP(X) = (50){0.12) + (20mm) + (-1o)(o.43) a 15 - 4.3 p = 10.? Step 2: Finding The Variance sea-0.123300 c2 n 2 X2- PDQ - #2 at 520.4?19 #5 520.47