The police record the speed of vehicles passing a speed checkpoint. The speeds are recorded in the t

1. The police record the speed of vehicles passing a speed checkpoint.
The speeds are recorded in the table below.

Speed (s mph)	Number of vehicles
$0</p></td><td><p style="line-height: 1.7" class="text-lg tracking-wide font-normal leading-relaxed">\(5$
$20</p></td><td><p style="line-height: 1.7" class="text-lg tracking-wide font-normal leading-relaxed">\(8$
$40</p></td><td><p style="line-height: 1.7" class="text-lg tracking-wide font-normal leading-relaxed">\(37$
$50</p></td><td><p style="line-height: 1.7" class="text-lg tracking-wide font-normal leading-relaxed">\(47$
$60</p></td><td><p style="line-height: 1.7" class="text-lg tracking-wide font-normal leading-relaxed">\(3$

i) Calculate an estimate of the mean speed of the vehicles.

..................... mph [4]

ii) Explain why it is not possible to use the information from this table to calculate the exact value of the mean speed.

[1]

Nov 2018 J560/06 2

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