Answer: C. 461
Step-by-step explanation:
We know that the formula to find the sample size is given by :-
, where 
= Population standard deviation from prior study.
E = margin of error.
z* = Critical value.
As per given , we have
E= 15
Significance level : 
Critical value (Two tailed)=
Now , Required sample size = 
[Round to next integer]
Hence, the required sample size to be taken is 461.
Correct answer = C. 461
Diana drove 169.5 miles in total.
Step-by-step explanation:
Average speed first = 50 miles
Driving time = 1.5 hours
Distance = Speed*Time
Average speed afterwards = 42 miles
Driving time = 2.25 hours
Distance=Speed*Time
Total distance = 75+94.5
Total distance = 169.5 miles
Diana drove 169.5 miles in total.
Keywords: distance, speed
Learn more about speed at:
#LearnwithBrainly
Seven and five hundred thirty thousanths
Answer:
Step-by-step explanation:
I don’t know, can I get help answering this
