Answer:
The answer to your question is 60.7 km
Step-by-step explanation:
This is a ratio and proportion problem, so let's write the proportion.
3 : 26 : : 7 : x
1.- Convert the expression to a fractional form.
2.- Solve the proportion, cross multiplying and back off.
x =
x =
x = 60.7 km
Answer:
(0.767,0.833)
Step-by-step explanation:
The 95% confidence interval for population proportion p can be computed as
The z-value associated with 95% confidence level is 1.96.
whereas p=x/n
We are given that x=440 and n=550.
p=440/550=0.8
Thus, the required confidence interval is
0.767<P<0.833 (rounded to 3 decimal places)
Hence, we are 95% confident that our true population proportion will lie in the interval (0.767,0.833)