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What are the steps in computing the mean of a probability distribution of a random variable?

How is it similar to the procedure in finding the mean of a frequency distribution?


Sagot :

1.Step 1: Convert all the percentages to decimal probabilities. For example:

95% = .95

2% = .02

2% = .02

1% = .01

Step 2: Construct a probability distribution table.

Step 3: Multiply the values in each column. (In other words, multiply each value of X by each probability P(X).)

Referring to our probability distribution table:

0 × .95 = 0

1 × .02 = .02

2 × .02 = .04

3 × .01 = .03

Step 4: Add the results from step 3 together.

0 + .02 + .04 + .03 = .09 is the mean.

2. It is easy to calculate the Mean: Add up all the numbers, then divide by how many numbers there are.

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