Rachana had an average score of $45$ from $6$ tests. Her teacher dropped her lowest score,which is $30$,and calculated the average of the remaining scores to decide her grade. Which of the following gives her new average score?
- A$\frac{(45 \times 5 - 30)}{5}$
- B$\frac{(45 \times 5 - 30)}{6}$
- C$\frac{(45 \times 6 - 30)}{5}$
- D$\frac{(45 \times 6 - 30)}{6}$
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Similar Questions
In the formula $Z = l + \left( \frac{f_{1} - f_{0}}{2f_{1} - f_{0} - f_{2}} \right) \times c$,$f_{1}$ represents:
Easy
View SolutionIf $Z+M=88$ and $Z-M=2$,then $M=\ldots \ldots \ldots \ldots . .$
Medium
View SolutionThe median of the following frequency distribution is $525$ and the total frequency is $100$. Find the missing frequencies $x$ and $y$.
Class $0-100$ $100-200$ $200-300$ $300-400$ $400-500$ $500-600$ $600-700$ $700-800$ $800-900$ $900-1000$ Frequency $2$ $5$ $x$ $12$ $17$ $20$ $y$ $9$ $7$ $4$
| Class | $0-100$ | $100-200$ | $200-300$ | $300-400$ | $400-500$ | $500-600$ | $600-700$ | $700-800$ | $800-900$ | $900-1000$ |
| Frequency | $2$ | $5$ | $x$ | $12$ | $17$ | $20$ | $y$ | $9$ | $7$ | $4$ |
Difficult
View SolutionFind the mean of the following frequency distribution:
Class $10-20$ $20-30$ $30-40$ $40-50$ $50-60$ $60-70$ Frequency $2$ $10$ $40$ $25$ $13$ $10$
(in $.7$)
| Class | $10-20$ | $20-30$ | $30-40$ | $40-50$ | $50-60$ | $60-70$ |
| Frequency | $2$ | $10$ | $40$ | $25$ | $13$ | $10$ |
Medium
View SolutionIn the following distribution:
Monthly income range (in $Rs.$) Number of families Income more than $10000$ $100$ Income more than $13000$ $85$ Income more than $16000$ $69$ Income more than $19000$ $50$ Income more than $22000$ $33$ Income more than $25000$ $15$
The number of families having an income range (in $Rs.$) of $16000-19000$ is:
| Monthly income range (in $Rs.$) | Number of families |
| Income more than $10000$ | $100$ |
| Income more than $13000$ | $85$ |
| Income more than $16000$ | $69$ |
| Income more than $19000$ | $50$ |
| Income more than $22000$ | $33$ |
| Income more than $25000$ | $15$ |
The number of families having an income range (in $Rs.$) of $16000-19000$ is:
Easy
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