For a given frequency distribution,the frequencies of the first,second,and third class are $8$,$15$,and $18$ respectively. Then,the cumulative frequency of the third class is $\ldots \ldots \ldots \ldots .$
- A$23$
- B$33$
- C$41$
- D$26$
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Similar Questions
The following table gives the distribution of the lifetime of $400$ neon lamps:
Life time (in hours) Number of lamps $1500-2000$ $14$ $2000-2500$ $56$ $2500-3000$ $60$ $3000-3500$ $86$ $3500-4000$ $74$ $4000-4500$ $62$ $4500-5000$ $48$
Find the median lifetime of a lamp.
| Life time (in hours) | Number of lamps |
| $1500-2000$ | $14$ |
| $2000-2500$ | $56$ |
| $2500-3000$ | $60$ |
| $3000-3500$ | $86$ |
| $3500-4000$ | $74$ |
| $4000-4500$ | $62$ |
| $4500-5000$ | $48$ |
Find the median lifetime of a lamp.
Difficult
View SolutionThe median of the following frequency distribution is $50$ and the total frequency is $60$. Find the missing frequencies $x$ and $y$.
Class $0-20$ $20-40$ $40-60$ $60-80$ $80-100$ Frequency $5$ $x$ $20$ $y$ $2$
| Class | $0-20$ | $20-40$ | $40-60$ | $60-80$ | $80-100$ |
| Frequency | $5$ | $x$ | $20$ | $y$ | $2$ |
Medium
View SolutionIf the median of the distribution given below is $28.5,$ find the values of $x$ and $y$.
Class interval Frequency $0-10$ $5$ $10-20$ $x$ $20-30$ $20$ $30-40$ $15$ $40-50$ $y$ $50-60$ $5$ Total $60$
| Class interval | Frequency |
| $0-10$ | $5$ |
| $10-20$ | $x$ |
| $20-30$ | $20$ |
| $30-40$ | $15$ |
| $40-50$ | $y$ |
| $50-60$ | $5$ |
| Total | $60$ |
Difficult
View SolutionThe abscissa of the point of intersection of the less than type and of the more than type cumulative frequency curves of a grouped data gives its
Easy
View SolutionThe following is the distribution of weights (in $kg$) of $40$ persons:
Weight (in $kg$) $40-45$ $45-50$ $50-55$ $55-60$ $60-65$ $65-70$ $70-75$ $75-80$ Number of persons $4$ $4$ $13$ $5$ $6$ $5$ $2$ $1$
Construct a cumulative frequency distribution (of the less than type) table for the data above.
| Weight (in $kg$) | $40-45$ | $45-50$ | $50-55$ | $55-60$ | $60-65$ | $65-70$ | $70-75$ | $75-80$ |
| Number of persons | $4$ | $4$ | $13$ | $5$ | $6$ | $5$ | $2$ | $1$ |
Construct a cumulative frequency distribution (of the less than type) table for the data above.
Medium
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