OAU Mathematics 2020/2021 - Model Past Questions

The fifth term of an A.P. is 24 and the eleventh term is 96. Find the first term.

A binary operation on the set of real numbers excluding -1 is such that for all m, n ε R, m Δ n = m + n + mn. Find the identity elmeent of the operation.

Find the values of x and y respectively if ${(\table 1,0;-1,-1;2,2) + (\table x,1;-1,0;y,-2) = (\table -2,1;-2,-1;-3,0)}$

What is the mean of the data t, 2t-1, t-2, 2t-1, 4t and 2t+2?

Find the median of 4, 1, 4, 1, 0, 4, 4, 2, and 0.

5, 8, 6 and k occur with frequencies 3, 2, 4 and 1 respectively and have a mean of 5.7. Find the value of k.

What is the mean deviation of x, 2x, x + 1 and 3x, if their mean is 2?

What is the mean deviation of 3, 5, 8, 11, 12 and 21?

If y varies directly as the square root of x and y = 3 when x = 16, calculate y when x = 64.

If three unbiased coins are tossed, find the probability that they are all heads?