Sally travels to work by train every day. The probability that her train will be late on any day is 0.16
Thursday
Friday
a) Complete the probability tree
diagram for Thursday and
0.16
late
Friday
(2)
late
b) Work out the probability that
0.16
her train will be late on at
0.84
least one of these two days. (3)
not late
1
0.16
late
+
0.84
not late
0.84
not late