The heights in cm, of 10 children are 145, 163, 159, 162, 167, 149, 150, 160, 170, and 155. The standard deviation of the heights of the children is

If un = 2, 6, 10, ..., the 12th term of the sequence is

The _______ is often the preferred measure of central tendency if the data are severely skewed.

As a general rule, the _______ is the best measure of central tendency because it is more precise.

If y = 5cos(-6x), dx/dy is

Which of the following is the formula for range?

The roof of a shelter is made from a piece of corrugated iron 2.3m long inclined at 18º to the horizontal. How far from the wall does the roof stick out?

A is the point (1, 5), B is the point (4, 7) and C is the point (5, 2). Triangle ABC is

Find the sum to infinity of the following series 3 + 2 + 4 + 4/3 + 8/9 + 16/27 + ......

The length of a rectangle is three times its width. If the perimeter is 72 cm, the width of the rectangle is

Ann goes swimming regularly. She wants to improve her fitness, so she decides to swim 10 lengths in the first session and increase the number of lengths she swims by 2 every session. When she reaches 50 lengths in a session she will not increase the number any further. After how many sessions does Ann swim 50 lengths for the first time?

The sum of the first 20 terms of the progression 3, 6, 12, ... is

Rationalize $\frac{(4\sqrt{7}+\sqrt{2})\; /}{(\sqrt{2}-7)}$

Find the number of sides of a regular polygon whose interior angle is twice the exterior angle.

If x and y represent the mean and the median respectively of the following marks of students in a Mathematics test; 11, 12, 13, 14, 15, 16, 17, 18, 19, 21. Find x/y correct to 1 decimal place.

Find the variance of the numbers k, k + 1, k + 2.

In an arithmetic sequence with 25 terms, if the first term is 60 and last term is -12, the sum of the terms of the sequence is

Which of the following points does not lie on the line 2y + 5x -4 = 0?

The lengths of the sides of a right-angled triangle are ym, (3y - 1)m and (3y + 1)m, find y.

What is the length of an arc of a circle with a radius of 5 if it subtends an angle of 60° at the center?

P is the point (3, 5). Q is the point (-1, 9). R is the midpoint of PQ. Which one of the following lines does R lie on?

If 35 is the median of the data set including 21, 7, 45, 33, 62 and x, then x =

Ann goes swimming regularly. She wants to improve her fitness, so she decides to swim 10 lengths in the first session and increase the number of lengths she swims by 2 every session. When she reaches 50 lengths in a session she will not increase the number any further. If Ann asks her friend Joy to come swimming with her, Joy starts coming at Sue’s 8th session. Joy starts to swim 15 lengths and increases the number of the lengths by 5 each time. After how many of Joy’s sessions does she swim the same number of lengths as Ann?

What is the slope of the line that is perpendicular to y - 2x = 1?

What is the sum of the first 40 even positive integers?

A company employs 100 people, 65 of whom are men. 60 people including all the women are paid weekly. The number of the men that are paid weekly is

P is the point (2, 7) and Q is the point (6, 3). What is the gradient of PQ?

No of children: 0, 1, 2, 3, 4, 5, 6
No of families: 7, 11, 6, 7, 7, 5, 3
Find the mode and median respectively of the distribution above.

Two dice are thrown. What is the probability that the sum of the two numbers obtained is greater than 10?

Find all the values of $x$ satisfying the inequality $-14\le 4-3x\le 31$

At what value of x is the function y = x² - 6x - 7 minimum?

_________ are used when you want to visually examine the relationship between two quantitative variables.

Find the principal which amounts to ₦4,400 at simple interest in 5 years at 2% per annum

A ladder resting on a vertical wall makes an angle whose tangent is 2.5 with the ground. If the distance between the foot of the ladder and the wall is 60 cm, what is the length of the ladder?

List the integral values of which satisfy the inequality $-2<7-3x\le 10$.

One of these is not a desirable feature of a good statistical table

A straight line has a gradient of -2 and passes through the point (4, 1). What is its equation?

Find the value of p, if the line which passes through (-1, p) and (-2p, 2) is parallel to the line 2y + 8x - 17 = 0.

Paul and his friend, Peter went to buy an article costing ₦600. Peter had 10% of the cost and Paul, 40% of the remainder. How much did they have altogether?

A ladder 20m long rests against a vertical wall so that the foot of the ladder 9m from the wall. The height (correct to 1 decimal place above the ground at which the upper end of the ladder touches the wall is