exam Maths Puzzle Numerical Ability

Find the mean and the median.
-2, -7/4, 3/4, 4, 9
These are my choices. I came up with Mean 2, Median 3/4 but I am not positive.

Mean 2, Median 3/4
Mean 10, Median 2
Mean 2, Median 2
Mean 10, Median 3/4

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exam Other Question
Please help me solve

Find the domain and the range of the functions f(x), g(x), and h(x)

if
f(x)= 7x-40
g(x)= 70
h(x)= -x^2 + 6x Thanks for your help!!
Jill has $3.50 in nickles and dimes.If she has 50 coins, how many of each type of coin does she have? McGraw Hill 6th edition,8.2, # 56.