Question

1. Calculate the variance and standard deviation of the frequency distribution below, correct to 2d.p
Marks. 1-5 6-10 11-15 16-20 21-25 26-30
Frequency. 6. 4. 5. 5. 6. 4.

2. Let A,B and C be three non-collinear points. Find the resultant of the vectors.
I) 2AB. 2BC. CA
ii) 5BC. - 5AC

Answer 1

Answer:

the answer is 5BC.-5AC