5. The grades of John in eight subjects were 97, 90, 92, 93, 89, 95, and 96. What should be his grade in his 9th subject if he wants to have a general weighted average of 93?

6. Find the median of the first 9 natural numbers

7. The weight in pounds of 15 swimmers who joined the swimming competition is as

follows:

125 160 173 156 129 182 192 115 133 110 200 162 168 145 171

Find the median weight.