Question

Rachna had an average score of $45$ from $6$ test. 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. $\frac{(45\times 6-30)}{6}$

Answer 1

The correct option is C $\frac{(45\times 6-30)}{5}$

Average score of $45$ in $6$ test $=45\times 6$
Her teacher dropped her last score $=45\times 6-30$
Total number of test consider $=5$
Hence, the new formula formed will be $\frac{(45\times 6-30)}{5}$