3 years ago

George wants to buy a shirt that costs $69.00. He has a 20% off coupon. How much will

Mathematics

1 answer:

Vesnalui [34]3 years ago

7 0

Answer:

Step-by-step explanation:

the shirt costs $ 69....he has a 20% off coupon

lets find out how much he saves by using the coupon....so we find 20% of $ 69..

20% of 69....turn ur percent to a decimal...." of " means multiply

0.2(69) = $ 13.80 <== what the coupon saved him

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Answer: a) (1008.34,1019.658) b) (1009.24,1018.76)

Step-by-step explanation:

Since we have given that

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At 95% two sided , z = 1.96

So, confidence interval would be

$\bar{x}\pm z\dfrac{\sigma}{\sqrt{n}}\\\\=1014\pm 1.96\dfrac{25}{\sqrt{75}}\\\\=1014\pm 5.658\\\\=(1014-5.658,1014+5.658)\\\\=(1008.34,1019.658)$

(b) Construct a 95% lower confidence bound on the mean life.

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So, confidence interval would be

$\bar{x}\pm z\times \dfrac{\sigma}{\sqrt{n}}\\\\=1014\pm 1.65\times \dfrac{25}{\sqrt{75}}\\\\=1014\pm 4.76\\\\=(1014-4.76,1014+4.76)\\\\=(1009.24,1018.76)$

Hence, a) (1008.34,1019.658) b) (1009.24,1018.76)

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