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Date	May Specimen	Marks available	2	Reference code	SPM.1.sl.TZ0.1
Level	SL only	Paper	1	Time zone	TZ0
Command term	Complete	Question number	1	Adapted from	N/A

Question

Consider the frequency histogram for the distribution of the time, $t$ , in minutes of telephone calls that Helen made last week.

Complete the frequency table for this distribution.

[2]

Write down the modal class.

[1]

Write down the mid interval value of the $10 < t \leqslant 15$ class.

[1]

Use your graphic display calculator to find an estimate for the mean time.

[2]

Markscheme

(A2) (C2)

Note: Award (A2) for four correct entries, (A1) for three correct entries, (A0) otherwise.

$0 < t \leqslant 5$ (A1) (C1)

$12.5$ (A1) (C1)

$\frac{{275}}{{30}}$ (M1)

Note: Award (M1) for division with $275$ seen.

$= 9.17$ ( $9.16666 \ldots$ ) (A1)(ft) (C2)

Note: Follow through from their parts (a) and (c), irrespective of whether working is shown.

Examiners report

[N/A]

Syllabus sections

Topic 2 - Descriptive statistics » 2.3 » Grouped discrete or continuous data: frequency tables; mid-interval values; upper and lower boundaries.

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