= Year 7/8 = CHANCE & DATA = Worksheet 4
1. The monthly average temperature for the city of Zenji:Jan / Feb / Mar / Apr / May / Jun
33 / 29 / 31 / 30 / 27 / 24
Jul / Aug / Sep / Oct / Nov / Dec
22 / 23 / 26 / 30 / 30 / 31
Find the range and median of the monthly average temperature. / 2. Draw a line graph to show the monthly average temperature for the city of Zenji.
Jan
3. The marks in % of 21 students in a class are:
67, 77, 79, 44, 53, 72, 80, 68, 80, 73, 79
82, 79, 55, 47, 91, 71, 49, 61, 57, 59.
Construct an ordered stem and leaf plot
for the marks. / 4. Find the average and the median of the marks in Q3.
5. The marks in Q3 are grouped. With class intervals 40-49,
50-59, 60-69, 70-79, 80-89, construct a frequency table. Which one is the modal class? / 6. Use the frequency table in Q 5 to construct a histogram.
7. A new student is added to the class (in Q3), her mark is 88. Find the new average and median. / 8. The number of hours of TV watched by 10 students after school: 3, 2.7, 3.1, 2.6, 1.3, 3.9, 2.6, 3.3, 0.8, 4.5
Use a stem and leaf plot to present the data.
9. Find the average number and the median number of hours of TV watched by the 10 students after school in Q8. / 10. In Q8 the first 5 numbers of hours are watched by girls and the last 5 for boys. Construct a back-to-back stem and leaf plot with girls on the left.
11. Refer to Q8. What is the percentage of students who watch more than 3 hours of TV after school? / Numerical, algebraic and worded answers.
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