Page 82 - Math SL HB Sem 3
P. 82
(a) (i) Write down (he'nredian weckly wage.
(iD Find the interquartile range ofthe weekly wages. [4 marks]
The box-and-whisker plot below displays the weekly wages ofthe ernployees.
II
50 ct b 470 c
(b) Write down the value of
(D a
(iD b
(iii) c. [3 marksJ
Employees are paid $20 per hour.
G) Find the median number of hours worked per week. [3 marksJ
(d) Find the number of employ ees who work more than 25 houn week. [5 narksJ
J N I I /5/MATME/SP 1 /ENG/TZOIX X
9. [Maximum mark: 6]
'l'he
randorn variable X has the following probability distribution.
-r I 2 J
P(X r) ,l 0.3 q
=
Given that E(X) t.7. 6n4 ,
=
N I 2/5A4ATMF/SP }ENG/TZOIXX
E. [Maximum mark: 6J
The lollowing table shows the probability distribution of a discrete random variable X.
x 0 2 5 9
P(X = x) 0.3 k 2k 0.1
[j marksJ
(a) Find the value of /<.
(b) Find E(x).
[3 morksJ
b
