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2.2 Data presentation and interpretation

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Question 10

The ages of the 200 individuals in a supplied health data set are grouped below.

Age a (years)10≤a<2020≤a<3030≤a<4040≤a<5050≤a<6060≤a<7070≤a<8080≤a<90Frequency3226392620231519\begin{array}{c|cccccccc}\text{Age }a\text{ (years)}&10\leq a<20&20\leq a<30&30\leq a<40&40\leq a<50&50\leq a<60&60\leq a<70&70\leq a<80&80\leq a<90\\\hline\text{Frequency}&32&26&39&26&20&23&15&19\end{array}Age a (years)Frequency​10≤a<2032​20≤a<3026​30≤a<4039​40≤a<5026​50≤a<6020​60≤a<7023​70≤a<8015​80≤a<9019​​

a.

State the modal class.

[1]
b.

Find the probability that an individual selected at random from the data set is aged at least 70.

[2]
Markscheme

2.2 Data presentation and interpretation Questions

  1. A Level
  2. /Maths
  3. /2.2 Data presentation and interpretation

105 exam-style questions on WJEC A Level Maths 2.2 Data presentation and interpretation, covering 2.2.1 Data presentation and interpretation, 2.2.2 Data presentation and interpretation, 2.2.3 Data presentation and interpretation, 2.2.4 Data presentation and interpretation, 2.2.5 Data presentation and interpretation, 2.2.6 Data presentation and interpretation, 2.2.7 Data presentation and interpretation, 2.2.8 Data presentation and interpretation, and 2.2 Data presentation and interpretation. Each one has a worked solution and a mark scheme showing where the marks go.

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