Question

find the mean of each data set mentally. • 40, 40, 40, 44 • 40, 40, 40, 36 • 40, 40, 40, 100 • 40, 40, 40, 0

Explanation:

For the data set \(40, 40, 40, 44\)

Step1: Calculate the sum of the data set.

The sum is \(40 + 40 + 40 + 44 = 164\).

Step2: Divide the sum by the number of data points (which is 4).

The mean is \(\frac{164}{4} = 41\).

For the data set \(40, 40, 40, 36\)

Step1: Calculate the sum of the data set.

The sum is \(40 + 40 + 40 + 36 = 156\).

Step2: Divide the sum by the number of data points (which is 4).

The mean is \(\frac{156}{4} = 39\).

For the data set \(40, 40, 40, 100\)

Step1: Calculate the sum of the data set.

The sum is \(40 + 40 + 40 + 100 = 220\).

Step2: Divide the sum by the number of data points (which is 4).

The mean is \(\frac{220}{4} = 55\).

For the data set \(40, 40, 40, 0\)

Answer:

s:

• For \(40, 40, 40, 44\): \(41\)
• For \(40, 40, 40, 36\): \(39\)
• For \(40, 40, 40, 100\): \(55\)
• For \(40, 40, 40, 0\): \(30\)