7m find the area please
2 answers:
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Answer:
The answer is
Step-by-step explanation:
If we assume that people cannot taste a difference between bottled water, then the probability of identifying tap water is 0.5
Thus, P(identify tap water)=0.5
The probability that at least 8 of the 9 people identify the tap water correctly is the sum of the probabilities
- 8 of 9 people identified correctly or
- 9 of 9 people identified correctly
Since P(identify tap water)=0.5 each probabilities are the same and equal to
=
So we have =
The logarithmic expression is
To expand the expression we have to use some properties of logarithm.
We know that
By using this property we can write,
Square root means to the power 1/2, so for , we can write
.
Now we have to use another property of logarithm.
We know that,
So we will use this property to
Now we have to use another property of logarithm.
We know that,
By using this property we can write,
This is the required aswer here.