Central Tendency & Spread University Level

To find the average we use the following formula
 $\overline{x}=\frac{\sum_{x=1}^nx_i}{n}$  , What does n represent? 

• Add all numbers

• Count of numbers

• Maximum Value

• Minimum Value

What is the Less Total and the more total in these following data set.

45, 60, 65, 75, and 80.

• 65

• 25

• 45

• 80

Two students have their quiz scores:

Aisha: 60, 70, 80, 90.

Tala : 65, 75, 90, x.

Which of the following grades, will both students have same average ?

• 70

• 75

• 80

• 65

An employee have his wage depending on his working hours.

Over the past 5 days he earned :

1200, 800, 1100, 900, and 950.

He received a bounce of 100 on his largest wage. Which of the following will be changed. You may choose more than one answer.

• Mean

• Median

• Range

• Mode

In class a teacher decided to cancel the lowest quiz mark of two students.

Ali scores are : 75, 90, 65, 40.

Adnan's scores are : 79, 65, 55, 85.

Which student will benefit more from this decision?

• Ali will benefit more because his average will better than Adnan

• Adnan will benefit more because his average will better than Ali

• They both will be benefit from this decision.

• No affect on their average.

The price of oil increased to new record last month.

Which of the following is affect by this increase? (choose all that apply)

• Median

• Mean

• Range

• Mode

Find the median of the following:

6, 1, 2, 4, 7, 3, 2, 4, and 1.

• 1

• 7

• 3

• 6

Find the range of the following:

6, 1, 2, 4, 7, 3, 2, 4, and 1.

• 1

• 7

• 3

• 6

Find the mode of the following:

6, 1, 2, 4, 4, 3, 2, 4, and 1.

• 4

• 4 and 1

• 1

• No mode

Small Extreme or Large extreme:

Lets say that you have calculated the average and the median of your grades. The average was 50 and the median is 75. So you probably had very high mark? or very low mark?

• We can't decide.

• One or more high grades

• One or more low grades