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sdas [7]
3 years ago
9

A cell phone is on sale for $205 after a 20% off discount. What was the original price of the phone?

Mathematics
1 answer:
Leni [432]3 years ago
7 0

Answer:

256.25

Step-by-step explanation:

if you have a 20% discount then you are paying 80% if the original cost.

so 80% of the original price is 205

.80x = 205

x = 205/.80

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Nana76 [90]

Answer:

The correct option is (b).

Step-by-step explanation:

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The confidence interval for population mean can be computed using either the <em>z</em>-interval or <em>t</em>-interval.

The <em>t</em>-interval is used if the following conditions are satisfied:

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For computing a (1 - <em>α</em>)% confidence interval for population mean , it is necessary for the population to normally distributed if the sample selected is small, i.e.<em>n</em> < 30, because only then the sampling distribution of sample mean will be approximated by the normal distribution.

In this case the sample size is, <em>n</em> = 28 < 30.

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The correct option is (b).

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2 years ago
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