Answer:
Roland is right, he can be 95% sure that average gas prices have gone up since the same time last year.
Step-by-step explanation:
Let μ be average gas price around Syracuse.
Then hypotheses are:
μ = $2.68
μ > $2.68
Then test statistic can be calculated as:
z=
where
- X is the Roland's calculated average gas prices of 50 gas stations ($2.74)
- M is the average average gas prices in the entire of Syracuse last year
- s is the standard deviation ($0.11)
Then z=
≈ 3.86
Since P-value of test statistic ≈ 0.00006 <0.05 (significance level), we can reject the null hypothesis.
Answer:
answer b
Step-by-step explanation:
Answer:
The answer to your question is: x = 27
Step-by-step explanation:
The are vertical angles, so they measure the same:
4x + 7 = 5(x - 4)
4x + 7 = 5x - 20 Expanding
4x - 5x = -20 - 7 Simplify like terms
-x = -27
x = 27
Answer:
the answer is C. 12.5
Step-by-step explanation:
its 12.5 because 60 min = 10 mile
and then 15 + 60 = 75 and a quarter of 60 is 15 which a quarter of 10 is 2.5 which you than add up to get 12.5
Answer:
30
Step-by-step explanation:
20% = 20/100= 1/5
It is 1/5 of the number 150
Taking the problem what is 20% of 150
Is means equals and of means multiply
what is 20% of 150
W = 20% * 150
Change 20% to a decimal
W = .20 * 150
W = 30