The table shows the time $30$ students spent reading on one evening. Reading time, $t$ (minutes)

Question

The table shows the time $30$ students spent reading on one evening. Reading time, $t$ (minutes)Frequency $0<t\leq10$$4$ $10<t\leq20$$12$ $20<t\leq30$$8$ $30<t\leq40$$6$ Find the number of students who read for more than $20$ minutes. [1] Can the exact number of students who read for more than $15$ minutes be determined? Explain your answer and find the least and greatest possible numbers. [3] The data are regrouped into two classes: $0<t\leq20$ and $20<t\leq40$. State the frequency of each new class and identify the new modal class. [2]

Accepted Answer

(a) $14$ (b) No; least $14$, greatest $26$ (c) Frequencies $16,14$; modal class $0<t\leq20$

Reading time, \(t\) (minutes)	Frequency
\(0<t\leq10\)	\(4\)
\(10<t\leq20\)	\(12\)
\(20<t\leq30\)	\(8\)
\(30<t\leq40\)	\(6\)

Statistics - Interpreting and Evaluating Statistical Representations

Statistics - Interpreting and Evaluating Statistical Representations

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