The positive square root of mean of the squared deviations of xi(i=1,2,3…..n) observations from their arithmetic mean is called……….
a)Harmonic mean
b)range
c) S.D
d)variance
The class having maximum frequency is called ………..class.
a) Modal
b) Mean
c)Lower
d) Upper
The arrangement of data is necessary to find the value of…….
a)mean
b) Median
c)mode
d)Range
