Professor has decided to give a standardized statistics exam that is nationally normed, meaning that we can use the norm

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Professor has decided to give a standardized statisticsexam that is nationally normed, meaning that we can use the normalmodel and the population mean and standard deviation are knownvalues. The normal model is N(79, 4) which tells us the meanstatistics score is 79 with a standard deviation of 4.
Professor currently uses a 10-point scale (100-90 A, 80-89B, 70-79 C, 60-69 D, below 60 F) but wants to scale her ownstudents' tests based on this data by using the percentiles. To dothis, she needs to find the new values that correspond to the 90th,80th, 70th and 60th percentiles, which will give the new lowervalue for each grade scale. Simple right?
find the values that correspond to the 90th, 80th, 70thand 60th percentiles, either with or without z-scores. Then givethe new range. Remember that you range should have an upper andlower value.