Statistics

Question

Botanists have determined that the length of time it takes one variety of plant seed to germinate is normally distributed wit a mean of 26 days and a standard deviation of 4 days. Find the probability that a randomly selected plant seed of this variety will germinate in less than 20 days.

Answer 1

Craig,

       First calculate the z score z=(20-26)/4=-1.5 then look up this z in a cumulative normal table and find p(z<-1.5)=.06681.

      So there is about a 7% chance that a randomly selected seed plant will germinate in less than 20 days.

 

Hope this helps

Jim