A tee-ball team for 5 year-olds has half as many girls as boys. If there are 15 children on the team, how many are boys and how
2 answers:
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Answer:
In a nutshell, .
Step-by-step explanation:
A composition is operation between function that consist in replacing the independent variable of the first function, in this case, for
. Common notations for composition between functions are
and
. If we know that
and
, then
.
In a nutshell, .
Answer : 0.0129
Step-by-step explanation:
Given : Based on FAA estimates the average age of the fleets of the 10 largest U.S. commercial passenger carriers is years and standard deviation is
years.
Sample size :
Let X be the random variable that represents the age of fleets.
We assume that the ages of the fleets of the 10 largest U.S. commercial passenger carriers are normally distributed.
For z-score,
For x=14
By using the standard normal distribution table , the probability that the average age of these 40 airplanes is at least 14 years old will be :-
Hence, the required probability = 0.0129