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Charra [1.4K]
2 years ago
8

Pumpkin pie is on sale for $12.50. How much will it cost to buy enough to feed 20 people? Please help me!

Mathematics
1 answer:
Sever21 [200]2 years ago
3 0

Answer:

$37.05

Step-by-step explanation:

thats what i got so it might not be right

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A manufacturer of running shoes knows that the average lifetime for a particular model of shoes is 15 months. Someone in the res
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Answer:

Step-by-step explanation:

Hello!

So you have a new type of shoe that lasts presumably longer than the ones that are on the market. So your study variable is:

X: "Lifetime of one shoe pair of the new model"

Applying CLT:

X[bar]≈N(μ;σ²/n)

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H₀:μ=15

H₁:μ≠15

The significance level for the test is given: α: 0.05

Your critical region will be two-tailed:

Z_{\alpha /2} = Z_{0.025}= -1.96

Z_{1-\alpha /2} = Z_{0.975}= 1.96

So you'll reject the null Hypothesis if your calculated value is ≤-1.96 or if it is ≥1.96

Now you calculate your observed Z-value

Z=<u>x[bar]-μ</u> ⇒ Z=<u>    17-15     </u> = 1.99

     σ/√n              5.5/√30

Since this value is greater than the right critical value, i.e. Zobs(1.99)>1.96 you reject the null Hypothesis. So the average durability of the new shoe model is different than 15 months.

I hope you have a SUPER day!

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