CHANGE IN ANSWER FOR QUESTION NUMBER 98 IN Q1QP1 MATHEMATICS

[ch19...@smail.iitm.ac.in]

I believe the answer proposed for Question 98 of Q1QP1 in Mathematics needs to be amended .The question requires us to compute the average of slopes at interval of 10 years after passing through the initial point (0,36).The average of the slopes as per the given data points turns out to be 3.75 which can be rounded off to 3.8 .Hence option 1 (y=3.8x+36) is the right option for the question .I request you to look into this and do the needful well before the results .

X Y Value of slope Slope

0 36               0 -

10 70             3.4           m1

20 110             3.7               m2

30 150         3.8                         m3

40 200         4.1                          m4

y=mx+c

Passes through (0,36) 

C=36

m=Average(m1,m2,m3,m4)

m=(m1+m2+m3+m4)/4

m=(3.4+3.7+3.8+4.1)/4

m=3.75 ≈ 3.8

PREDICTED LINE:  y=3.8x+36 OPTION 1