Listed below are the world record men’s weightlifting performances as of 2016.

a) Create a linear model for the Weight Lifted in each Weight Class, leaving out the 105+ unlimited class.
b) Check the residuals plot. Is your linear model appropriate?
c) Create a better model by re-expressing Weight Lifted and explain how you found it.
d) Explain why you think your new model is better.
e) The record holder of the Unlimited weight class weighs 157 kg. Predict how much he can lift with the models from parts a and c.

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Weight Class (kg) 56 62 69 77 85 94 105 105+ Record Holder Long Quingquan Kim Un-Guk Galain Boevski Lu Xiaojun Kianoush Rostami Ilya llyin Andrei Aramnau Lasha Tlakhadze Country China North Korea Bulgaria China Iran Kazakhstan Belarus Georgia Total Weight 307 327 357 379 396 418 436 473