Question 1 Report
The table shows the weights, to the nearest kilogram, of twelve students in a Further Mathematics class
(a) Draw a bar chart to illustrate the above information;
(b) What is (i) the mode; (ii) the median of the distribution?
(c) Calculate the mean weight correct to the nearest kilogram.
(a) Bar chart
Bar chart showing the frequency of each weight. The bars are separate because the weights are discrete values.
(b)(i) Mode
The highest frequency is 4, corresponding to a weight of 61 kg.
\[\boxed{\text{Mode}=61\text{ kg}}\]
(b)(ii) Median
There are \(12\) students. Therefore, the median is the mean of the 6th and 7th observations.
The ordered weights are:
\[55,\ 55,\ 57,\ 59,\ 59,\ \underbrace{61,\ 61}_{\text{6th and 7th}},\ 61,\ 61,\ 63,\ 63,\ 63\]
\[\text{Median}=\frac{61+61}{2}=\boxed{61\text{ kg}}\]
(c) Mean weight
\[\begin{aligned}\sum f&=2+1+2+4+3=12,\\\sum fx&=55(2)+57(1)+59(2)+61(4)+63(3)\\&=110+57+118+244+189\\&=718.\end{aligned}\]
\[\text{Mean}=\frac{\sum fx}{\sum f}=\frac{718}{12}=59.833\ldots\text{ kg}\]
\[\boxed{\text{Mean weight}=60\text{ kg, correct to the nearest kilogram}}\]
Answer Details
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