3 years ago

Brianna wants to save the $250 she earned by babysitting over the summer. She's trying to decide which

Mathematics

1 answer:

Nookie1986 [14]3 years ago

8 0

Answer:

Total cost = Cost per month × 12 months per year × Number of years

= $21 × 12 × 8

= $2,016

Step-by-step explanation:

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51 grams.

Step-by-step explanation:

After 25 seconds 204 * 1/2 = 102 grams is left.

So after 50 seconds ( 2 * 25), 102 * 1/2 = 51 g are left.

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3 years ago

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A company manufacturing a roadside lighting system wants to estimate the average illuminance (brightness) at sunset. The illumin

jeka94

Answer:

(364.595 ; 391.405)

Step-by-step explanation:

Given the sample data:

406, 385, 389, 383, 352, 379, 388, 343, 368, 387

Using calculator :

Sample mean, xbar = 378

Standard deviation, s = 18.74

Confidence interval :

Xbar ± Margin of error

Margin of Error = Tcritical * s/√n

TCritical at df = 24 ; 0.05 = 2.262

Margin of Error = 2.262 * 18.74/√10 = 13.405

Lower boundary = (378 - 13.405) = 364.595

Upper boundary = (378 + 13.405) = 391.405

(364.595 ; 391.405)

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3 years ago