Statistics: Arithmatic Mean

The video tutorial explains how to calculate the mean of test scores for two teachers' classes. It begins by defining the mean as the sum of all items divided by the number of items. The tutorial then calculates the mean for Teacher One's class, which has six scores, resulting in a mean of 78.5. Next, it calculates the mean for Teacher Two's class, which has eight scores, resulting in a mean of 79.5. Teacher Two's class has the higher mean score, making them the winner.

What is the formula for calculating the mean of a set of numbers?

• Multiply all numbers together and divide by the count

• Add all numbers together and divide by the count

• Divide the largest number by the smallest

• Subtract the smallest number from the largest

How many test scores are there in Teacher One's class?

• 5

• 6

• 8

• 7

What is the mean score for Teacher One's class?

• 80.5

• 78.5

• 76.5

• 82.5

How many test scores are there in Teacher Two's class?

• 9

• 8

• 6

• 7

Which teacher's class had the higher mean score?

• Both had the same mean score

• Teacher Two

• Teacher One

• Neither, both were below average