Mathematics
If the classes of a frequency distribution are 1 - 10, 11 - 20, 21 - 30, …., 51 - 60, then the size of each class is
9
10
11
5.5
Related Questions
The following distribution represents the height of 160 students of a school.
Height (in cm) No. of students 140 - 145 12 145 - 150 20 150 - 155 30 155 - 160 38 160 - 165 24 165 - 170 16 170 - 175 12 175 - 180 8 Draw an ogive for the given distribution taking 2 cm = 5 cm of height on one axis and 2 cm = 20 students on the other axis. Using the graph, determine :
(i) The median height.
(ii) The inter quartile range.
(iii) The number of students whose height is above 172 cm.
100 pupils in a school have heights as tabulated below :
Height (in cm) No. of pupils 121 - 130 12 131 - 140 16 141 - 150 30 151 - 160 20 161 - 170 14 171 - 180 8 Draw the ogive for the above data and from it determine the median (use graph paper).
If the classes of a frequency distribution are 1 - 10, 11 - 20, 21 - 30, ….., 61 - 70, then the upper limit of the class 11 - 20 is
20
21
19.5
20.5
In a grouped frequency distribution, the mid-values of the classes are used to measure which of the following central tendency?
median
mode
mean
all of these