Question

U.I Seclol EXercise 4/, 48 (calc) 7 and standard deviation σ-& Round the answers to four A normal population has m ean μ decimal places. Part 1 out of 2 What proportion of the population is less than 20? The proportion of the population less than 20 is CHECK NEXT Sa

Answer 1

20-7 X-7 P(x 20) P , = P (Z 1.63)[Zable] = 0.9484 Thus the proportion of the population less than 20 is 0.9484 P(X >108)-1PX 108) PX-61 108-61 =1-Pl-20 -s- 20 = 1-P (Z 2.35)[Z table] = 1-0.9906 = 0.0094 Thus the proportion of the population greater than 108 is 0.0094