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The table shows that the rate of reaction doubles for each increase of 30°C: the rate at 50°C is approximately 2 times the rate at 20°C, and the rate at 60°C is approximately twice the rate at 30°C.
When the rate doubles for each linear increase in temperature, it means we have an exponential relationship between the 2 parameters: the rate of reaction will increase exponentially as temperature increases. (This is actually described in the equation of Arrhenius but I assume that's out of scope here).
When you round it, you will indeed find 0.011. Only be aware that due to the exponential nature of the curve, the actual value with more decimals will be more than 0.011 (since it will be closer to 0.012 than to 0.010). But with 3 decimals, you will indeed have 0.011
Yes, it's between the values fo 30°C and 40° so that's your only reasonable estimate there.