(a) Use logarithm tables to evaluate . (b) The first 5 students to arrive in a school on a Monday morning were 2 boys and 3 girls. Of these, two were chosen at random for an assignment. Find the probability that : (i) both were boys ; (ii) the two were of different sexes.
Explanation
(a)
No
Log
15.05
= 0.0985
- 2.8420
Antilog = 0.001805
=
(3 sig. figs) (b) No of boys = 2, No of girls = 3 Total students = 5 (i) P(both are boys) = (ii) P(both are of different sexes) = P(first a boy, then a girl) or P(first a girl, then a boy) = = =
