Question

if mean=12.2 and sigma fi=100, then sigma fidi= ?​

Answer 1

Answer:

1220

Here is your answer in the attachment

Answer 2

The value of sigma $f_{i}d_{i}$ is 1220

• Mean is one of the common measures of central tendency.
• It is the ratio of sum of observations to number of observations.
• When dealing with unequally weighted variables, its formula is given as follows

                    $Mean=\frac{sigma(f_{i}d_{i})}{sigma(f_{i})}$

• Given,

                 mean = 12.2

                 $sigma(f_{i})=100$

                 $sigma(f_{i}d_{i})=?$

                 $12.2=\frac{sigma(f_{i}d_{i})}{100}$

                 $(12.2)(100)=sigma(f_{i}d_{i})$

                 $(1220)=sigma(f_{i}d_{i})$

                 $sigma(f_{i}d_{i})=1220$

                 Therefore, the value of $sigma(f_{i}d_{i})$ is 1220