821. for computing mean of a grouped data the major assumption we make is_________
A. All values are discrete
B. No value occurs more than once
C. Each class contains exactly the same number of values
D. Every value in a class is equal to the midpoint

822. By the change of ______________ measures of dispersion are changed.
A. origin
B. scale
C. Algebra Sign
D. none of these

823. When deviations are taken from __________ sum of absolute deviation of the value is least.
A. Median
B. mode
C. Mean
D. weighted mean

824. Which are the most commonly used measures of dispersion in quality control of manufactured items?
A. Mean deviation
B. standard deviation
C. Quartile deviation
D. range

825. what is the sum of 10 numbers if there mean is 9
A. 70
B. 80
C. 90
D. 100

826. For finding the average speed of a journey which is the appropriate average?
A. Geometric mean
B. Harmonic mean
C. Arithmetic mean
D. mode

827. What is the geometric mean of two numbers x and y?
A. xy
B. x – y
C. x + y
D. square root of xy

828. If all observations are increased by 10% and mean of 10 observations is 10. What is the increased observation?
A. 15
B. 100
C. 30
D. 11

829. 2, 4, 8 and 64, find the geometric mean of these numbers.
A. 64
B. 32
C. 16
D. 8

830. Mean, median and mode are always ______________ if the distribution is symmetrical.
A. never equal
B. Always equal
C. sometimes equal
D. none of these

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