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katen-ka-za [31]

4 years ago

6

What numbers are equivalent to 1/4 1/6

1 answer:

dlinn [17]4 years ago

6 0

Answer:equals 25 percent

Step-by-step explanation:

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In a random sample of microwave ovens, the mean repair cost was $ and the standard deviation was $. Using the standard normal

Semmy [17]

Complete Question

In a random sample of 13 microwave ovens, the mean repair cost was $90.00 and the standard deviation was $15.20. Using the standard normal distribution with the appropriate calculations for a standard deviation that is known, assume the population is normally distributed, find the margin of error and construct a 98% confidence interval for the population mean u. A 98% confidence interval using the t-distribution was (78.7,101.3). Compare the results. The margin of error of u is

Answer:

The value is $E = 11.65$

Step-by-step explanation:

From the question we are told that

The sample is $n = 13$

The sample mean is $\= x = \$ 90$

The standard deviation is $\sigma = \$ 15.20$

The lower limit of the 98% confidence interval is $a = 78.7$

The upper limit of the 98% confidence interval is $b = 101.3$

Generally the margin of error is mathematically represented as

$E = \frac{b-a}{2}$

=> $E = \frac{ 101.3 - 78 }{2}$

=> $E = 11.65$

7 0

3 years ago

E radius of a sphere is 3 inches. Which represents the volume of the sphere?

gregori [183]

Answer:

the answer is 121 c inches

Step-by-step explanation:

3 0

3 years ago

a normal distribution has a mean of 10 and a standard deviation of 1 what is the probability of selecting a number between 8 and

rusak2 [61]

Answer:

0.815

Step-by-step explanation:

First, find the z-scores.

z = (x − μ) / σ

z₁ = (8 − 10) / 1

z₁ = -2

z₂ = (11 − 10) / 1

z₂ = 1

P(-2 < Z < 1) = P(Z < 1) − P(Z < -2)

Use a chart, calculator, or the empirical rule to find the probability.

Using the empirical rule:

P(-2 < Z < 1) = 0.84 − 0.025

P(-2 < Z < 1) = 0.815

Using a chart:

P(-2 < Z < 1) = 0.8413 − 0.0228

P(-2 < Z < 1) = 0.8185

5 0

4 years ago

Mr. Gill is draining his pool. The pump he is using changes the water level by −2 1/4 inches per hour. A stronger pump would dra

professor190 [17]

Answer:

-5.625 in/hour

Step-by-step explanation:

−2 1/4 * 2 1/2 = -5.625 in/hour

7 0

3 years ago

Determine if the two triangles are congruent. If they are, state how you know.

mylen [45]

If two sides and the included angle of one triangle are equal to the corresponding sides and angle of another triangle, the triangles are congruent.

3 0

3 years ago