Heating oil is to be poured at the constant rate of 4.5 gallons per minute into a 400-gallon tank that already contains 115 gall
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Answer:
The value is
Step-by-step explanation:
From the question we are told that
The mean is
The standard deviation is
The safest water level is between 7.2 and 7.8
Generally the probability that the selected pool has a pH level that is not considered safe is mathematically represented as
Here
Generally
So
=>
From the z-table the probability of (Z < -1.5) and ( Z <1.5) are
and
So
So
=>