Question


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| No. of ball bearings | $2$ | $4$ | $6$ | $8$ | $10$ | $12$ | $14$ | $16$ |
| No. of machines | $2$ | $2$ | $4$ | $5$ | $3$ | $2$ | $1$ | $1$ |
| Particulars | Series A | Series B |
| No. of observations | $40$ | $50$ |
| Average | $25$ | $30$ |
| The sum of squares of deviations taken from mean | $640$ | $1800$ |