2 years ago

By what number would you multiply both sides of the equation to solve it? m/-3 =25

Mathematics

1 answer:

katrin [286]2 years ago

4 0

Step-by-step explanation:

you can clear decimals from the equation

use multiplication property of equality to multiply both sides of the equation.

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The life in hours of a 75-watt light bulb is known to be normally distributed with standard deviation σ = 25 hours. A random sam

irina [24]

Answer: a) (1008.34,1019.658) b) (1009.24,1018.76)

Step-by-step explanation:

Since we have given that

n = 75

mean = 1014 hours

Standard deviation = 25 hours

At 95% two sided , z = 1.96

So, confidence interval would be

$\bar{x}\pm z\dfrac{\sigma}{\sqrt{n}}\\\\=1014\pm 1.96\dfrac{25}{\sqrt{75}}\\\\=1014\pm 5.658\\\\=(1014-5.658,1014+5.658)\\\\=(1008.34,1019.658)$

(b) Construct a 95% lower confidence bound on the mean life.

z = 1.65

So, confidence interval would be

$\bar{x}\pm z\times \dfrac{\sigma}{\sqrt{n}}\\\\=1014\pm 1.65\times \dfrac{25}{\sqrt{75}}\\\\=1014\pm 4.76\\\\=(1014-4.76,1014+4.76)\\\\=(1009.24,1018.76)$

Hence, a) (1008.34,1019.658) b) (1009.24,1018.76)

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3 years ago

If u help I’ll give u brainliest but please give correct answer

Black_prince [1.1K]

Answer:

here is no question sorry

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3 years ago

Arithmetic and geometric

NISA [10]

I don’t understand the question

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3 years ago

If a man take one and a half mins to paint a door how much doors can he paint in seven half hour

sashaice [31]

Answer:

300 doors.

Step-by-step explanation:

1.5 minutes for 1 door.

7.5 hours for 300 doors.

7.5 hours = 450 minutes.

$\frac{450}{1.5}=300$

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3 years ago

after an oil pipeline burst one morning gas prices went up by $2.20 per gallon at the afternoon you bought 10 gallons of gas for

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3 years ago

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