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Get access to the detailed solutions to the previous years questions asked in IIM IPMAT exam
From the given chart, we can find the average rating on day 2:
We are given the cumulative average of day 1 and day 2 as 3.1, and the average at the end of day 1 is 3.
Let's take the number of ratings received on day 1 as ; using this overall average and the average on day 2, we get the equation:
3x + 170 = 3.1x + 155
15 = 0.1x
x = 150
Therefore, the number of ratings received on day 1 is 150.