The times,in seconds,taken by $150$ athletes to run a $110\, m$ hurdle race are tabulated below:
Class (seconds) $13.8-14.0$ $14.0-14.2$ $14.2-14.4$ $14.4-14.6$ $14.6-14.8$ $14.8-15.0$ Frequency $2$ $4$ $5$ $71$ $48$ $20$
The number of athletes who completed the race in less than $14.6\, s$ is:
| Class (seconds) | $13.8-14.0$ | $14.0-14.2$ | $14.2-14.4$ | $14.4-14.6$ | $14.6-14.8$ | $14.8-15.0$ |
| Frequency | $2$ | $4$ | $5$ | $71$ | $48$ | $20$ |
The number of athletes who completed the race in less than $14.6\, s$ is:
- A$11$
- B$71$
- C$130$
- D$82$
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If $M = 72$ and $\bar{x} = 70$,then $Z = \ldots \ldots \ldots \ldots$
Medium
View SolutionFind the mean of the following frequency distribution:
Class $0-10$ $10-20$ $20-30$ $30-40$ $40-50$ $50-60$ $60-70$ $70-80$ Frequency $2$ $4$ $10$ $20$ $18$ $20$ $16$ $10$
| Class | $0-10$ | $10-20$ | $20-30$ | $30-40$ | $40-50$ | $50-60$ | $60-70$ | $70-80$ |
| Frequency | $2$ | $4$ | $10$ | $20$ | $18$ | $20$ | $16$ | $10$ |
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View SolutionConstruction of a cumulative frequency table is useful in determining the
Easy
View SolutionFind the mean,median and mode of the following frequency distribution:
Class $5-10$ $10-15$ $15-20$ $20-25$ $25-30$ $30-35$ Frequency $11$ $20$ $35$ $20$ $8$ $6$
| Class | $5-10$ | $10-15$ | $15-20$ | $20-25$ | $25-30$ | $30-35$ |
| Frequency | $11$ | $20$ | $35$ | $20$ | $8$ | $6$ |
Difficult
View SolutionConsider the following distribution:
Marks obtained Number of students More than or equal to $0$ $63$ More than or equal to $10$ $58$ More than or equal to $20$ $55$ More than or equal to $30$ $51$ More than or equal to $40$ $48$ More than or equal to $50$ $42$
The frequency of the class $30-40$ is:
| Marks obtained | Number of students |
| More than or equal to $0$ | $63$ |
| More than or equal to $10$ | $58$ |
| More than or equal to $20$ | $55$ |
| More than or equal to $30$ | $51$ |
| More than or equal to $40$ | $48$ |
| More than or equal to $50$ | $42$ |
The frequency of the class $30-40$ is:
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