The one that is equations is 2
Probability of graduating is 73% = 0.73
Probability of not graduating = 1-73% = 0.27
Number of students (n) = 15
Number of graduates (x) = 8
Use the binomial probability formula:
P(x) = (n/x) *p^x * (1-p)^n-x
P(8) = 15/8 * 0.73^8 * 0.27^7
P(8) = 0.0543
Rounded to nearest hundredth = 0.05
Answer:
100 students should be surveyed in order to cut the width of the interval down from 3 hours to 1.5 hours
Step-by-step explanation:
Given that a 95% confidence interval, based upon a sample of size 25, for the mean number of hours of sleep that college students get per night was 5 to 8 hours.
Confidence interval = (5,8)
This implies that mean = 6.5 and margin of error = 1.5
i.e.
If the interval width to be cut into half then the
New confidence interval = (5.75, 7.25)
Margin of error = 0.75
This is possible only when new n= 100
Hence sample size should be increased to 100
100 students should be surveyed in order to cut the width of the interval down from 3 hours to 1.5 hours
Answer:
$125 and hour - (528.75 - 60) / 3.75
Step-by-step explanation:
Since the total includes the $60 for the parts, we have to subtract 60 from 528.75. Once we've found the difference (468.75), we can divide by the amount of hours (3.75). That leaves us with the answer, $125.