first picture is for steps and formula reference

please solve the question regarding 21 months and 9 fof variance. please help a-e

thank you!!

Using PERT, Adam Munson was able to determine that the expected project completion time for the construction of a pleasure yecht is 24 months, and itie project variance is 4 a) What is the probability that the project will be completed in 20 months? The stiandard nomal equation can be applied as follows Z=P(Duedate-Expecteddateofcompletion) where is the number of standard deviations the due date or target date lies from the mean or expected date and p is the projoct standard devatica which s ike square root of the variance. For the due date of 20 months, value of Z besed on the given intormation = (round your response to two decimal places) Using the stiondind nocmal teble, the probability that the project will be comploted in 20 months = 00229 " (round your response to four decimat places) b) Fon the due date ot 23 months, vatue of Z based on the given information = (round your response to hivo decina phaces) The probability that the project will be completed in 23 months =03085 (round you response fo four docimal places) c) For the duse date of 26 months, value of Z bused on the given information = (round your respanse to two decimal pluces). Using PERT, Adam Munson was able to determine that the expected project completion tme for the construction of a pleasure yacht is 21 montens, and the projoct variance is 9 ii) The probabity that the project will be completed in 12 months = (cound your response fo fore decimal places) b) The probability that the project will be completed in 20 months = (round your respanso to foutr docimal places) c) The probatility that the project will be completed in 24 months an (round your lesponse to foor decunal flaces). d) The probability that the prosect will be completed in 30 months in pound your response to four decimat places) 6) The due date that yields a ins chance of compeetion - months (round your cesponse ro tivo decima places)