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प्रश्न
If the mean of five observations x, x + 2, x + 4, x + 6, x + 8, is 11, then the mean of first three observations is
पर्याय
9
11
13
15
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उत्तर
9
Explanation;
Hint:
Mean = `(x + x + 2 + x + 4 + x + 6 + x + 8)/5`
11 = `(5x + 20)/5`
5x + 20 = 55
5x = 55 – 20
= 35
x = `35/5`
= 7
Mean of first 3 observation is = `(7 + 9 + 11)/3`
= 9
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संबंधित प्रश्न
Following table shows the points of each player scored in four games:
| Player | Game 1 | Game 2 | Game 3 | Game 4 |
| A | 14 | 16 | 10 | 10 |
| B | 0 | 8 | 6 | 4 |
| C | 8 | 11 | Did not play | 13 |
Now answer the following questions:
- Find the mean to determine A’s average number of points scored per game.
- To find the mean number of points per game for C, would you divide the total points by 3 or by 4? Why?
- B played in all the four games. How would you find the mean?
- Who is the best performer?
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