The 140 employees in a factory are either right-handed (RH) or left-handed (LH). 65 of the employees are male.
31 of the females are left-handed.
90 of the employees are right-handed.
a) Complete the frequency tree for this information.
RH
male
65
I
LH
140
RH
female
One of the 140 employees is chosen
at random
b) Write down the probability that this
person is a left-handed female.
LH
31
(3)
(1)
Total marks: 4