How to solve this statistic question related to goodness of fit test?

Each new Employed who wins & construction company is issued with a pair of safety boots Which comes in five dads by 7 8, 9 and 10. The auth blow represent the sizes of the Safety bouts issued to the 140 most recent new employees. Safety boots size Frequency (and Bill, who is in charge of ordering the safety boots, believes that the distribution of Safety binds required by new employees mery be mauled by the filling probability distribution. Safety burts size 6 8 9 10 Probability 0. 15 0. 20 0. 30 0. 20 0. 15 Test, at the 0.05 level of significance, whether this distribution adequately models the Safety boots required bey new employees. Assume that the 40 most recent new 4 Bill is about to order 1000 new safety boots with the production of each sled Me indicated buy the portability distribution, Advise Bill AS to Whether he should modify the proportions of the sizes in the order. If miu advise him to modify the order, stute, in power was, how min believe the portion should be changed