A sample of 2,500 people was asked how many cups of coffee they drink in the morning. You are given the following sample information. Cups of Coffee Frequency 0 700 1 900 2 600 3 300 2,500 Refer to Exhibit 5-7. The variance of the number of cups of coffee is .

V(X) = 0.96

Step-by-step explanation: Variance is defined as the average of the squared difference from the sample or population mean.

For a discrete frequency distribution is calculated following the steps:

1) Determine expected value or mean:

E(X) = 1.2

2) Multiply frequency and the squared difference of x and expected value:

3) Add them:

= 1008 + 36 + 384 + 972 = 2400

4) Divide the sum per frequency total:

V(X) = 0.96

The variance of the number of cups of coffee is 0.96.

answer

106 emergencies

step-by-step explanation: