An aircraft has 120 passenger seats.


An aircraft has 120 passenger seats. The number of seats occupied during 100 flights is given in the following table.

Determine the mean number of seats occupied over the flights.


We first, find the class mark xi, of each class and then proceed as follows.

$\therefore \quad$ Assumed mean, $a=110$,

Class width, $h=4$

and total observation, $N=100$

By assumed mean method,

$\operatorname{Mean}(\bar{x})=a+\frac{\Sigma f_{j} d_{j}}{\Sigma f_{i}}$


Leave a comment


Click here to get exam-ready with eSaral

For making your preparation journey smoother of JEE, NEET and Class 8 to 10, grab our app now.

Download Now