How to Calculate the Expected Mean in Statistics

To avoid errors, use a calculator when finding expected value.
••• keypad image by vashistha pathak from Fotolia.com

The term expected value refers to the logic that over the long term of doing an experiment multiple times, you would " expect" this number. The expected value (mean) is simply the average of any set of numbers. Whether you are trying to find the average yearly snowfall for your city or the average age of homes in your neighborhood, you can quickly and easily find the expected value of any set of numbers with simple math.

    Determine the number of items or variables that are to be calculated. For example, if you are trying to determine the expected value weight of students in your class, you must first count the number of students in your class. We'll call this number "n." If there are 20 students in the class, then n=20.

    Determine the value of each item or variable. Using the classroom example, write down the weight of each student. You should have 20 weights written down because there are 20 students in the class.

    Add all the values. Add together all of the weights into one large sum. Make sure you add each person's weight. Always figure the sum twice to make sure you have added correctly.

    Dive by "n". Take the sum from Step 3 and divide by n from Step 1. For example, If the sum of all of the student's weights is 2,143, then divide 2,143 by 20. The expected value or average weigh of the students is 107.15.

    Things You'll Need

    • Pen or pencil
    • Paper
    • Calculator

Related Articles

How to Calculate Weighted Totals
How to Compute a Population Mean
How to Calculate Percentiles
How to Convert Numerical Grade Point Average
How to Calculate Average Age
How to Calculate a Cumulative Numerical Average
How do I Calculate a Test As 20% of a Grade?
How to Get the Average of Decimals
What Are Math Computation Skills?
How to Find the Height of a Rectangular Pyramid
How to Calculate the Weight of an Object
How to Calculate Percent Relative Range
How Do You Solve Two-Step Equations With Fractions?
How to Interpolate Numbers
How to Calculate the Jump Height From Acceleration
How to Calculate 2/3 of a Number
How to Calculate Weighted Class Grades
How to Teach Math Percentages to 6th Grade
How to Make Math Fun for Kids
How to Figure Survey Percentages

Dont Go!

We Have More Great Sciencing Articles!