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P(-2/s.d.<Z <2/s.d.)=0.9 Using normal distribution table find Z=1.645 2/s.d.=1.645 we get S. D. =2/1.645=1.216=1.22   (in 2 decimal)  Standard deviation(s.d.) = 1.22 Solution file is attached go through it Sol" Manger of night club in Boston sitated that 90% of custirmess are between ages of 22 and 26 years i.e. P(22 < x < 26)=0.90If Customers is nomally Distribyted with mean =24 years calculate its standared Deritition using 2-s are =(x-mu)/(T){:[P((22-mu)/(sigma) < (x-mu)/(sigma ... See the full answer