There are two pumps to fill a tank with water. The first pump can fill the empty tank in 6 hours, while the second in 8 hours. If both the pumps are opened at the same time and kept open for 2 hours, the part of tank that will be filled up is:
\( \frac{9}{10} \)
\( \frac{9}{12} \)
\( \frac{7}{12} \)
\( \frac{7}{10} \)
What is the mode of the data given below? [Give your answer correct to 2 decimal places.]
| Age in years | 10-20 | 20-30 | 30-40 | 40-50 | 50-60 | 60-70 | 70-80 |
| No. of patients | 29 | 35 | 25 | 10 | 18 | 34 | 17 |