The price of a jacket was reduced from $80 to $64. By what percentage was the price of the jacket reduced?

Mathematics

1 answer:

aleksley [76]2 years ago

7 0

Answer:

The asnwer is 20%

Step-by-step explanation:

80 times .20 is 16, 80-16 is 64, hoipe i helped!

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Answer:

5/52

Step-by-step explanation:

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Juan and his little brother Miguel ran around a circular track together. Juan ran on the inner track, which has a radius of 30 f

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Answer:

80pi-60pi

Step-by-step explanation:

To find how much Juan ran, we must find the circumference.

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Read 2 more answers

The life in hours of a 75-watt light bulb is known to be normally distributed with standard deviation σ = 25 hours. A random sam

irina [24]

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

Step-by-step explanation:

Since we have given that

n = 75

mean = 1014 hours

Standard deviation = 25 hours

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.

z = 1.65

So, confidence interval would be

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