Calculate, correct to one decimal place, the standard dev...
Calculate, correct to one decimal place, the standard deviation of the numbers: -1, 5, 0, 2 and 9.
7.2
6.6
3.6
3.2
Correct answer is C
| x | -1 | 5 | 0 | 2 | 9 | Total = 15 |
| x−ˉx | -4 | 2 | -3 | -1 | 6 | |
| (x−ˉx)2 | 16 | 4 | 9 | 1 | 36 | 66 |
Mean = 155=3
SD = √∑(x−ˉx)2n
= √665
= √13.2
= 3.6
A body of mass 15kg is placed on a smooth plane which is inclined at&n...
A linear transformation T is defined by T: (x,y) → (3x - y, x + 4y). Find the image of (2, -1) ...
Three forces F_{1} = (8 N, 300°), F_{2} = (6 N, 090°) and F_{3} = (4 N, 180°) ac...
If sin x = \frac{12}{13} and sin y = \frac{4}{5}, where x and y are acute angles, find&...
The gradient of point P on the curve y = 3x^{2} - x + 3 is 5. Find the coordinates of P....
A man of mass 80kg stands in a lift. If the lift moves upwards with acceleration 0.5ms^{-2}, cal...
Evaluate \int_{1}^{2} [\frac{x^{3} - 1}{x^{2}}] \mathrm {d} x...
Express \frac{3}{3 - √6} in the form x + m√y...
The table shows the distribution of marks obtained by some students in a test Marks 0-9 10-...