(Sample Material) CSAT Online Coaching : Basic Numeracy "Statistics"
Sample Material of Our Online Coaching Programme
Subject: Basic Numeracy
Topic: Statistics
1. The daily wages (in rupees) of 100 labourers is
given in the following frequency distribution. Find the mean of the data.
Daily wages 21-40 41-60 61-80 81-100
101-120
No. of labours 10 25
40 20
5
(a) 67
(b) 67.5
(c) 68
(d) None of these
2.If m is the arithmetic mean of x1, x2,...xn, then the arithmetic mean of ax1 + b, ax2 + b,...axn + b, is
(a) m
(b) m + b
(c) am + b
(d) am
3. The standard deviation of (x + 1), (x + 2), (x + 3), (x + 8), (x + 7) and (x + 9), where x is not equal to zero is:
4. The AM of 5 observations is 4.4 and the variance is 8.24. If 3 of the observations are 1, 2 and 6, then the other two are
(a) 8, 5
(b) 4, 9
(c) 7, 6
(d) 2, 11