Question 1191285
z=(x-mean)/sd
z=(48-40)/5.5
=1.454
probability <48 minutes is 0.9271
use the table and find that for probability 0.5271 being less than a certain number of minutes, z=0.068
.
The probability that z is between 0.068 and 1.454 is 0.40
0.064=(k-40)/5.5
0.352=(x-40)
k=40.352 minutes