A total of 165 people attended the opening night of a school play. Adults were charged $6, and children were charged $2. The tot
2 answers:
Answer:
Step-by-step explanation:
A total of 165 people attended the opening night of a school play.
Let there were adults = x and number of children = y
So x + y = 165 ----------(1)
Now we know adults were charged $6 and children $2.
The total amount collected $618
so 6x + 2y = 618 ----------(2)
Now the augmented matrix for the system of equations will be
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Answer:
a) 14.46%
b) 0.00%
c) 1.54%
Step-by-step explanation:
According to the survey, 10% of Americans are afraid to fly.
This means and
.
If 1100 Americans are sampled, then the sample size is .
The mean of the distribution is .
This means
The standard deviation is
We substitute the values to get:
a) We want to find the probability that 121 or more Americans in the survey are afraid to fly.
We first apply the continuity correction factor to get:
We now convert to Z-scores to get:
From the standard normal distribution table P(z>1.06)=0.1446
As a percentage, the probability is 14.46%
b) We want to find the probability that 165 or more Americans in the survey are afraid to fly.
We apply the CCF to get:
We convert to z-scores:
From the normal distribution, P(z>164.5)=0
c) First, 8% of 1100 is 88.
We want to find the probability that 88 or less Americans in the survey are afraid to fly.
We apply the CCF to get:
We convert to z-scores:
From the normal distribution, P(z>\:-2.16)=0.0154
As a percentage, we get 1.54%