Answer:
The 95% confidence interval based on this sample is =
[6.41, 7.79]
Step-by-step explanation:
The formula for Confidence Interval =
Mean ± z × standard deviation/√n
Sample mean = 7.1 hours
Standard deviation = 5 hours
n = 200 students
z = 95% confidence interval z score
= 1.96
C.I = 7.1 ± 1.96 × 5/√200
C.I = 7.1 ± 0.693
Hence, Confidence Interval
= 7.1 - 0.693
= 6.407
Approximately = 6.41
= 7.1 + 0.693
= 7.793
Approximately = 7.79
Therefore, the 95% confidence interval based on this sample is
[6.41, 7.79]
Answer:
<u>Step-by-step explanation:</u>
Monica has some cookies: x
She gave seven to her sister: x - 7
Then she divided the remainder into 2:
She still had five cookies left:
To solve, multiply both sides by 2, then add 7 to both sides.
Answer:
3
Step-by-step explanation:
just did it
the ones place is the first digit to the left of the decimal point
so 4 is in the ones place
149x15=2235. If there were 8 duds in 149 it averages a dud every 18 firecrackers. So we know there's 2086 more so we for sure know there is more than 10 most likely more than 15 I'm assuming 15-30 so if there are any answers in that range I think it could be the answer (if more than one answer is in that range let me know and I'll try figuring out the exact answer)