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Let x1,x2,x3,………,xn be n observations . ...

Let `x_1,x_2,x_3,………,x_n` be n observations . Let `W_i = lx_i + k` for i=1,2,……,n, where l and k are constants. If the mean of `x_i's ` is 48 and their standard deviation is 12, the mean of `w_i's` is 55 and standard deviation of `w_i's` is 15, the values of l and k should be ..........

A

l = 1.25 and k = -5

B

l = -1.25 and k = 5

C

l = 2.5 and k = -5

D

l = 2.5 and k = 5

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The correct Answer is:
A
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KUMAR PRAKASHAN-STATISTICS-NCERT EXEMPLAR PROBLEMS (OBJECTIVE TYPE QUESTIONS)
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