exam Maths Puzzle Numerical Ability

15)A pen cost y dollars,how much will 25 such pens cost?_.

16)Divide n dollars among 11 people. How much will each get?_.

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exam Other Question

A biologist has found the average weight of 12 randomly selected mud turtles to be 8.7 lb with standard deviation 3.6 lb. Find a 90% confidence interval for the population mean weight of all such turtles. I am trying to come up with a answer to this equation?

2.7 + 0.8n = 4