Add : 12/81 + 17/81 + 15/81

Mathematics

1 answer:

slava [35]3 years ago

7 0

12 + 17 + 15 = 44

44/81

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In a random sample of five mobile devices, the mean repair cost was $90.00 and the standard deviation was $14.00. Assume the

aniked [119]

Answer:

The correct option is;

B. With 95 percent confidence, it can be said that the repair cost is between the bounds of the confidence interval

Step-by-step explanation:

Here we have the formula for confidence interval, CI given as follows;

$CI=\bar{x}\pm t\frac{s}{\sqrt{n}}$

Where:

$\bar x$ = Sample mean = $90.00

s = Sample standard deviation = $14.00

n = Sample size = 5

t = z value for the confidence level = 2.7764 from z-score relations

Plugging in the values, we have;

$CI=90.00\pm 2.7764 \frac{14.00}{\sqrt{5}}$

Which gives the CI as 72.6167 to 107.38.

8 0

3 years ago

Please help me with this math

fredd [130]

The part D is the correct one...

8 0

3 years ago

the length of diagonal of a rectangular field is 23.7 m and one of its sides is 18.8 m. find the perimeter of the field.

katen-ka-za [31]

Answer:

Approximately 66.4 Meters

Step-by-step explanation:

So we have a rectangle with a width of 18.8 meters and a diagonal with 23.7 meters. To find the perimeter, we need to find the length first. Since a rectangle has four right angles, we can use the Pythagorean Theorem, where the diagonal is the hypotenuse.

$a^2+b^2=c^2$