6 POINTS please HELP !
Suppose a manufacture makes disposable peppercorn grinders the number of peppercorn in the grinder is normally distributed with a mean of 322 peppercorns and a stranded deviation of 5.3 peppercorns.
Suppose the manufacture will only sell pepper corn grinders with z-score between -0.9 and 0.9
what are the least and most peppercorns and grinders can contain ?
A. least:290 ; Most: 354
B. least: 275 ; Most: 369
C.least: 318 ; most: 326
D.least: 308 ; most: 336
