Answer:
a) 0.6032
b)
Lower limit: 0.48
Upper limit: 0.72
Step-by-step explanation:
In a sample with a number n of people surveyed with a probability of a success of 
, and a confidence level of 
, we have the following confidence interval of proportions.
In which
z is the zscore that has a pvalue of 
.
Question a:
In a random sample of 63 professional actors, it was found that 38 were extroverts.
We use this to find the sample proportion, which is the point estimate for p. So
Question b:
Sample of 63 means that 
95% confidence level
So 
, z is the value of Z that has a pvalue of 
, so 
.
The lower limit of this interval is:
The upper limit of this interval is:
Rounding to two decimal places:
Lower limit: 0.48
Upper limit: 0.72
5 x $5.62 = $28.10 is how much Michael spent.
$28.10 + $6.72 = $34.82 is how much Jeremy spent.
You already know that Julie spent $5.62
Answer:
420 minutes
Step-by-step explanation:
1 hour = 60 minutes
7 * 1 hour = 7 * 60 minutes
7 hours = 420 minutes
Answer:
15 seeds
Step-by-step explanation:
Set up a ratio that represents the problem:
Sown Seeds : Seeds That Grow
100 : 75
Find the unit rate:
The unit rate is when one of the numbers in a ratio is 1. For this problem, let's make the number of sown seeds equal to one.
To do this, divide by 100 on both sides of the ratio.
100 : 75
/100 /100
1 : .75
This means that if Tim sows 1 seed, .75 will grow.
Answer the question:
We need to find the number of seeds that would grow if Tim planted 20 seeds. Therefore, multiply by 20 on both sides of the ratio.
1 : .75
x20 x20
20 : 15
Therefore, if Tim plants 20 seeds, we would expect 15 to grow.
