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3 years ago

13

alice can drive 40 miles on a gallon of gas. gas cost $5 per gallon including taxes. how much will it cost alice for gas to driv

e 360 miles?

2 answers:

frez [133]3 years ago

7 0

Need points I’m sorry

Alex787 [66]3 years ago

5 0

It will cost $45 to go 360 miles :) I hope this helped and if it does mark me brainliest!

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Each year, all final year students take a mathematics exam. It is hypothesized that the population mean score for this test is 8

drek231 [11]

Answer:

95% Confidence interval: (96.06,103.94)

Step-by-step explanation:

We are given the following in the question:

Population mean, μ = 85

Sample mean, $\bar{x}$ = 100

Sample size, n = 30

Alpha, α = 0.05

Population standard deviation, σ = 11

95% Confidence interval:

$\mu \pm z_{critical}\frac{\sigma}{\sqrt{n}}$

Putting the values, we get,

$z_{critical}\text{ at}~\alpha_{0.05} = 1.96$

$100 \pm 1.96(\frac{11}{\sqrt{30}} ) = 100 \pm 3.94= (96.06,103.94)$

(96.06,103.94) is the 95% confidence interval for the population mean test score.

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