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mixer [17]
3 years ago
10

-7p X (-4r) X 39......​

Mathematics
1 answer:
julia-pushkina [17]3 years ago
6 0

Answer:

Step-by-step explanation:

if the question is

-7p * -4r * 39

then it's

-1*-1*7*4*39*p*r

now you just need a calculator to find the numbers that are multiplied together

-1 * -1 = 1

7*4=28

28*39*p*r

1092*p*r

1092pr

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Answer:

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Step-by-step explanation:

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2 years ago
The life of a manufacturer's compact fluorescent light bulbs is normal, with mean 12,000 hours and standard deviation 2,000 hour
vitfil [10]

Z value is a numerical  measurement that describe a value relationship to the mean of a group of values. The standard deviations is 1.25 above the mean is 14,500 hours.

<h3>Given information-</h3>

The mean for the bulb is 12,000 hours.

The standard deviation for the bulb is 2000 hours.

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To find out the how many standard deviation is 14500 mean away from the mean the z value of the mean should be calculated.

<h3>Z value</h3>

Z value is a numerical  measurement that describe a value relationship to the mean of a group of values. Z value is the ratio of the difference of the sample value x and mean \mu to the standard deviation. Thus the z value for the given mean \sigma is,

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z=1.25

Thus the standard deviations is 1.25 above the mean is 14,500 hours.

Learn more about the z value here;

brainly.com/question/62233

4 0
3 years ago
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Blizzard [7]

Step-by-step explanation:

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Step-by-step explanation:

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