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प्रश्न
Find the mean and the median of: 10,12, 12, 15, 15, 17, 18, 18, 18 and 19
उत्तर
Given data: 10,12, 12, 15, 15, 17, 18, 18, 18 and 19
Here, number of terms = 10 which is even
∴ Median =`1/2 {"n"/2 "th term" + ("n"/2 + 1)"th term"}`
`= 1/2 {10/2 "th term" + (10/2 + 1) "th term"}`
`= 1/2 {5 "th term" + 6 "th term"}`
`= 1/2 {15 + 17}`
`= 1/2 xx 32 = 16`
∴ Median = 16
Mean = `"Sum of observations"/"Number of observations"`
`= (10 + 12 + 12 + 15 + 15 + 17 + 18 + 18 + 18 + 19)/10`
`= 154/10 = 15.4`
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