Answer:
7/15
Step-by-step explanation:
hope this helps?:)
Answer:
150
Step-by-step explanation:
mark brainliest plz
5 girls to 2 boys, it’s not asking for boys and girls
Answer:
0.5333
Step-by-step explanation:

Please mark 2 brainliests because I need.
SOLUTION
The mean is 4min
standard deviation is 1min
the z score is

where

then we have

The probability the call lasted less than 3 min will be
Therefore, the probability that (z < -1 ) is
[tex]\begin{gathered} Pr(z<-1)=Pr(0
Hence, the percentage of the calls that lasted less than 3 min is 16%