The ages of members of a policy action group are normally distributed with a mean of 33 years and a standard deviation of 2 years.

There are 400 members in the group

About how many members are expected to be between 29 years old and 37 years old?

272

290

354

380

whosmans Apr 4, 2019

#1**+1 **

Use z-score tables to find out how many are less than 37.....then use table to find out how many are less than 29 subtract the #37 - #29

37 is 2 Standard deviations ABOVE 33 z score 2 corresponds to .9772

29 is 2 standard deviations BELOW 33 z score -2 corresponds to .0228

(.9772 - .0228) 400 = ~ 382 or 380 members

ElectricPavlov Apr 4, 2019