921. A bar chart constructed in which the area of each bar is proportional to the number of items in each group is known as
A.pi chart
B.histogram
C.frequency distribution table
D.polygon

922. 1st quartile is also known as
A.lower quartile
B.upper quartile
C.median
D.geometric mean

923. Value of [3(n +1)⁄4]th term is the formula of
A.variance
B.3rd quartile
C.2nd quartile
D.geometric mean

924. The square of the standard deviation is called
A.harmonic mean
B.variance
C.mode
D.2nd quartile

925. In the set 2, 4, 5, 4, 6, 5, 3, 4, 2, the mode is
A.2
B.5
C.4
D.3

926. When the cumulative frequencies are plotted against the end points of their respective class intervals and joined together, the resultant graph is called
A.cumulative frequency pentagon
B.cumulative frequency histogram
C.cumulative frequency hexagon
D.cumulative frequency polygon

927. The table which shows the frequency of each score is called a
A.polygon
B.pi chart
C.histogram
D. frequency distribution table

928. 3rd quartile is also known as
A.lower quartile
B.upper quartile
C.median
D.geometric mean

929. The monthly income of 5 persons are 3000, 5000, 4000, 2000 and 6000. Their arithmetic mean should be
A.4000
B.6000
C.5000
D.3500

930. The positive square root of the mean of the squared deviations of the values from their mean is known as
A.standard deviation
B.median
C.variance
D.harmonic mean