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Year 9 Maths Probability and Statistics

Grouped Data

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Questions
Question 1
15393

From the grouped frequency table

a) What is the class centre in the first row?
b) The sum of the frequencies is?

\[\begin{array}{ | c | c | c| }
\hline \quad \text{Class} \quad & \quad \text{Class Centre} \quad & \quad \text{Frequency } \quad \\
\hline 5-14& &9\\
\hline 15-24 & &17\\
\hline 25-34& &16\\
\hline 35-39& &8\\
\hline & \text{Total}& \\
\hline \end{array}\] 

a) 9.5 b) 50

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