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Mathematical Methods — Question 2

QCAA 2021, Paper 1 · 1 mark

Q2 · 2021 · Technology-freeSimple familiar1 mark

QUESTION 2

The table shows the time a technician has spent servicing photocopiers.
Time (in minutes)Frequency
0≤t<50\le t<510
5≤t<105\le t<1020
10≤t<1510\le t<1530
15≤t<2015\le t<2040
20≤t<2520\le t<25100
What is the probability that a given service required at least 10 minutes but less than 20 minutes?
(A)
0.15
(B)
0.35
(C)
0.70
(D)
0.85
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