Home › CBSE Class 11 (Commerce) › Mathematics › Statistics › Classes 10-20, 20-30, 30-40 have frequencies 1, …
Classes 10-20, 20-30, 30-40 have frequencies 1, 2, 1. Mean deviation about the mean?
A5
B4
C2.5
D10
Answer & Solution
Correct answer: A. 5
Midpoints 15, 25, 35 give mean 25, and the weighted absolute deviations total 20 over 4 observations, which is 5.
Related questions
A set has 8 equal observations. Its variance and range areVariance is the mean of squared deviations, whereas standard deviation isPopulation standard deviation of 2, 4, 4, 4, 5, 5, 7, 9 isWhy is range only a rough measure of dispersion?With Q1 = 20 and Q3 = 45, the quartile deviation (half the IQR) isFor the interquartile range, if Q1 = 20 and Q3 = 45, the IQR isWhy is the plain sum of squared deviations a poor dispersion measure for sets of unequal sThe sum of squared deviations of 5, 15, 25, 35, 45, 55 from their mean 30 is 1750. The var