PLEASE HELP!

1 answer:

6 0

Number of words that Courtney reads per minute = 110
Number of pages left in the book to read = 820
Number of words per page = 350
Then
Total number of words that Courtney
needs to read to finish the assignment = 820 * 350
= 287000 words
Courtney can read 110 words in = 1 minute
Then
Number of minutes required by
Courtney to read 287000 words = 287000/110
= 2609 minutes approx
= 2609/60 hours
= 43.48 hours
I hope the procedure is clear enough for you to understand.

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Given Information:

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Mean life of lithium batteries = μ = 645 hours

Standard deviation of lithium batteries = σ = 31 hours

Confidence level = 95%

Required Information:

Confidence Interval = ?

Answer:

$CI = 628.5 \: to \: 661.5 \: hours$

Step-by-step explanation:

The confidence interval is given by

$CI = \mu \pm t_{\alpha/2} (\frac{\sigma}{\sqrt{n}})$

Where μ is the mean life of lithium batteries, σ is the standard deviation, n is number of lithium batteries selected, and t is the critical value from the t-table with significance level of

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$CI = 645 \pm 2.131(\frac{31}{\sqrt{16}})$