Question
Find the missing frequency (p) for the following distribution whose mean is 7.68
| x: | 3 | 5 | 7 | 9 | 11 | 13 |
| f: | 6 | 8 | 15 | p | 8 | 4 |
✓
Answer
9
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The rainfall $($in $mm)$ in a city on $7$ days of a certain week was recorded as follows:
$i.$ Find the range of the rainfall in the above data.
$ii.$ Find the mean rainfall for the week.
$iii.$ On how many days was the rainfall less than the mean rainfall
→| Day | Mon | Tues | Wed | Thurs | Fri | Sat | Sun |
| Rainfall $($in $mm)$ | $0.0$ | $12.2$ | $2.1$ | $0.0$ | $20.5$ | $5.5$ | $1.0$ |
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$iii.$ On how many days was the rainfall less than the mean rainfall
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| x: | 15 | 17 | 19 | 20 + p | 23 |
| f: | 2 | 3 | 4 | 5p | 6 |
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