The times, $$$t$$$ minutes, taken by 150 students to complete a particular challenge are summarised in the following cumulative frequency table. $$$24 \%$$$ of the students take $$$k$$$ minutes or longer to complete the challenge. Use your graph to estimate the value of $$$k$$$. ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................

Mathematics

IGCSE&ALevel

CAIE

Exam No：9709_w20_qp_51 Year：2020 Question No：6(b)

Answer:

$150 \times 0 \cdot 76=114$
$k=45(\mathrm{mins})$

Knowledge points:

5.1.4 use a cumulative frequency graph (e.g. to estimate medians, quartiles, percentiles, the proportion of a distribution above (or below) a given value, or between two values.)

Answer:

Knowledge points:

Solution:

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