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Oduvanchick [21]

2 years ago

10

A pack of 6 red pens cost £2.76 what is the price per pen

2 answers:

jeyben [28]2 years ago

6 0

It’s £2.76 divided by 6 and it will equal £0.46

butalik [34]2 years ago

5 0

The price per pen would be 0.46 and here’s the work - hope this helped :)

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The confidence interval formula is computed by:

Xbar ± Z s/ sqrt (n)

Where:

Xbar is the mean

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90% confidence interval with a z value of 1.645

Sample size 40, 45

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So plugging that information in the data will give us a confidence interval:

For 1:

Xbar ± Z s/ sqrt (n)

= 180 ± 1.645 (2 / sqrt (40))

= 180 ± 1.645 (0.316227766)

= 180 ± 0.520194675

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For 2:

Xbar ± Z s/ sqrt (n)

= 179 ± 1.645 (4 / sqrt (45))

<span>= 179 ± 1.645 (0.596284794)</span>

therefore, the answer is letter b

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Neporo4naja [7]

Never Mind this is high school sorry

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