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Histograms, Frequency Polygons, Mean, Median, Mode, Class Mid-Point, Pie and Bar Charts

Q1. The masses of 50 similar castings are measured correct to the nearest 0.1 kg, and the results are shown below.
8.1 7.7 7.4 8.6 7.8 8.1 8.6 8.0 7.3 9.0
9.0 7.3 8.5 7.7 8.3 7.9 7.5 8.1 7.1 7.8
9.1 7.6 8.2 8.4 8.5 9.0 7.8 7.6 8.4 7.7
8.2 9.0 7.2 8.3 7.4 8.1 8.3 8,5 8.7 7.9
7.5 8.9 7.7 7.1 8.2 9.1 7.1 8.8 8.0 8.8
(a) From these results reproduce and fill out the table below
Class Class mid-point (x) Frequency(f) f.x
7.1 to 7.3
7.4 to 7.6
7.7 to 7.9
8.Oto8.2
8.3 to 8.5
8.6 to 8.8
8.9 to 9.1
(b) Draw the frequency polygon for the data.
(c) Draw the histogram for the data.
(d) Calculate:
(1) the mean (ii) the mode (iii) the median
All calculations must be shown and the graphs must be hand drawn.

QI. In a certain university the number of students enrolled by the faculties is given
the table below:
Faculty Number of
students
Business and administration 1950
Humanities and social science 2820
Physical and life sciences 1050
Technology 850
Total 6670
Manipulate the data above to produce:
(a) A pie chart.
(b) A bar chart.

Q2. The data below show the average temperature in °C for each month as indicated.
Month Jan March May July Sept bec
Temperature °C 4.5 8.1 15 21.8 17.2 3.8
Manipulate the above data to produce:
(a) A graph of temperature against month for the year.
(b) Use the graph to estimate the average temperature for the month of June.
(c) Use the graph to estimate the average temperature for the month of November.
The graph must be hand drawn with the estimated temperature for (b) and (c) clearly indicated on it.

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Solution Summary

Histograms, Frequency Polygons, Mean, Median, Mode, Class Mid-Point, Pie and Bar Charts are investigated.

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