Chapter Wise Test: Statistics
Total marks: 40
Duration: 1 hour
Name:_______________
Answer the following questions:
1.The pie chart represents 4 different masses.The mass of A is 1440 Kg and the mass of B is
2250 kg.Find
(a)the mass, in kg, of C[2]
(b)the angle, in degrees,of the sector representing mass D.[2]
2.
[8]
3.There are 30 students in the class.All students in the class take a test.Here are the marks in
the test for the 12 girls in the class.
35
42
67
83
21
24
56
32
69
98
x
49 where x≥70
(a)Find the median of the girl’s marks.[2]
The mean mark for the 12 girls is 54.5
(b)Find the value of x. [2]
The mean mark for the boys is 56.
(c)Calculate the mean mark for the 30 students in the class. [3]
4. The table gives information about the times taken, in minutes, by 200
students to complete an examination paper.
Time taken
(t minutes)
0 ≤ t <30
Frequency
10
30 ≤ t< 40
14
40 ≤ t < 60
60 ≤ t <80
80 ≤ t <90
90
54
32
(a) Calculate an estimate, to the nearest minute, of the mean time taken to complete the
examination paper.
(2)
(b) Find the modal class
(2)
(c) Find the median class
(2)
(d)Find the median time
(3)
(e)Sketch a histogram by using the table approximately by representing 1 cm each unit by
scale
(4)
One of these students is to be chosen at random.
(f)Calculate an estimate of the probability that this student took less than 60 minutes to
complete the examination paper by using the table.
(2)
5.The bar chart gives information
about the number of pieces of fried
chicken eats last month for each of
30 students in a class.
(a) Calculate the percentage of
students who eats more than 8
pieces of fried chicken last
month.[2]
(b)Calculate the mean number of
pieces of fried chiclen each students eats last month. [4]