Question

The time (in minutes) taken by John to solve each of $11$ sums are given as $5$, $4$, $6$, $4$, $4$, $5$, $4$, $6$, $5$, $7$ and $4$. John constructed a frequency table using the data as shown below.


Which of the following is correct about the unknown values or counts in the table?

• A. $a=6$
• B.
• C. $c=2$

Answer 1

The correct option is B

John solved $5$ sums in $4$ minutes, $3$ sums in $5$ minutes, $2$ sums in $6$ minutes and $1$ sum in $7$ minutes.

The corresponding frequency table for the given data is as follows


From the above frequency table, it is clear that $a=5$ and $c=1$. The tally mark for $5$ is only the correct one for the unknown $b$ as given in the option (b).