Question


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| Details | Mean | Median | First quartile | Third quartile | Standard deviation |
| Firm $A$ | $350$ | $344$ | $324$ | $356$ | $26$ |
| Firm $B$ | $360$ | $340$ | $330$ | $370$ | $38$ |
| Advertisement cost (thousand $Rs$. ) | $0 – 5$ | $5 – 15$ | $15 – 30$ | $30 – 40$ | $40 – 60$ | $60 -100$ | Total |
| No. of companies | $3$ | $8$ | $15$ | $10$ | $8$ | $6$ | $50$ |