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3 years ago

14

A shopkeeper marks his goods at 40% above cost (the price he pays for the goods) and then offers a 25% discount.if a jacket cost

s the shopkeeper $200,at what price is it sold?

1 answer:

Pachacha [2.7K]3 years ago

3 0

Answer:

A shopkeeper marks:

$200 * 1.4 = $280

Step-by-step explanation:

With a discount of 25%:

$280 * 0.75 = $210

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Step-by-step explanation:

Given

The data for 25 undergraduates

Solving (a): Range and Standard deviation

The range is:

$Range = Highest - Least$

From the dataset:

$Highest = 772$

$Least = 687$

So:

$Range = Highest - Least$

$Range = 772-687$

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The standard deviation is:

$\sigma = \sqrt{\frac{\sum(x - \bar x)^2}{n}}$

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So, the standard deviation is:

$\sigma = \sqrt{\frac{(769-724.2)^2 +(691-724.2)^2 +(699-724.2)^2 +(730-724.2)^2 +............+(715-724.2)^2}{25}}$

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Solving (b): The interval of the 95% of the observation.

Using the emperical rule, we have:

$Interval = [\bar x - 2*\sigma, \bar x+ 2*\sigma]$

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