JEE Main Questions
Calculate mean deviation about mean from the following data: xi: 3 9 17 23 27 fi: 8 10 12 9 5
The blood groups of 30 students of Class VIII are recorded as follows: A, B, O, O, AB, O, A, O, B, A, O, B, A, O, O,A, AB, O, A, A, O, O, AB, B, A, O, B, A, B, O. Represent this data in the form of a frequency distribution table. Which is the most common, and which is the rarest, blood group among these students?
If for distribution of 18 observations ∑(xi−5)=3and∑(xi−5)2=43, find the mean and standard deviation.
An analysis of monthly wages paid to workers in two firms A and B, belonging to the same industry, gives the following result No. of wage earners Firm A Firm B Mean of monthly wages Rs 5253 Rs 5253 Variance of the distribution 100 121 of wages (i) Which firm A or B pays larger amount as monthly wages?(ii) Which firm, A or B, show greater variability in individual wages?
The following table gives the distribution of the life time of 400 neon lamps Find the median life of a lamp.
Find the mode of the following marks (out of 10) obtained by 20 students:4, 6, 5, 9, 3, 2, 7, 7, 6, 5, 4, 9, 10, 10, 3, 4, 7, 6, 9, 9