Given:
Average of five consecutive numbers is 12
Formula Used:
Average = Sum of observations /Number of observations
Solution:
Let the consecutive numbers A,B,C,Dand E be x ,x+1,x+2,x+3,x+4 respectively
Then total sum of numbers = x+x+1+x+2+x+3+x+4= 5x +10
Average of numbers = 12
Total of numbers = 5 ×12 = 60
So,
5x+10 =60
5x=50
x=10
A =x =10
D =x +3 = 13
Product of A and D is 10 × 13 = 130
English
10 Questions
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12 Mins English English50 Questions100 Marks60 Mins English English10 Questions20 Marks12 Mins EnglishFor different sets of datasets X and Y. correlation coefficient between X and Y, that is R and standard deviation of X and Y, that is, S(X) and S(Y) are given in A-D below. Estimate the covariance between X and Y for each dataset and arrange in ascending order.
A. R= 0.5, S(X)= 8, S(Y)= 10
B. R= 4/7, S(X)= 7, S(Y)= 9
C. R= 0.7, S(X)= 12, S(Y)= 5
D. R= 19/42, S(X)= 14, S(Y)= 6
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