2 years ago

What’s this answer ? Please help!

Mathematics

1 answer:

tensa zangetsu [6.8K]2 years ago

8 0

Answer:

Step-by-step explanation:

10 + 4 + 4 + 5 + 10 + 6 + 6 +2 + 2 or multiply them like this.

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2 years ago

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2 years ago

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A random sample of the closing stock prices in dollars for a company in a recent year is listed below. Assume that sigma is $2.

garik1379 [7]

Answer:

[ 17.8941, 19.6621]

Step-by-step explanation:

Given:

widths :

18.41 19.11 18.67 18.97 21.97 17.26 18.69 16.73 21.97 16.43 21.97 21.66 18.77 17.93 15.47 16.44

Total number of observations = 16

Mean of the sample = $\frac{\textup{Sum of observations}}{\textup{Total number of observations}}$

= $\frac{\textup{300.45}}{\textup{16}}$

= 18.7781

For 90% confidence level, z value = 1.645

Therefore,

Margin of error, E = $z\frac{\sigma}{\sqrt n}$

= $1.645\times\frac{2.15}{\sqrt{16}}$

= 0.884

thus,

Confidence interval = Mean ± E

Confidence interval = [18.7781 - 0.884 , 18.7781 + 0.884 ]

= [ 17.8941, 19.6621]

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2 years ago