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krek1111 [17]
3 years ago
10

×

Mathematics
2 answers:
german3 years ago
4 0

Let

x------> hours worked by Sara last week

y------> hours worked by Joan last week

z------> hours worked by Erin last week

we know that

x=28 hours ------> equation 1

y=x-6-----> equation 2

substitute the value of x in equation 2

y=28-6=22 hours

z=y/2------> equation 3

substitute the value of y in the equation 3

z=22/2=11 hours

<u>the answer is</u>

Sara worked 28 hours last week

Joan worked 22 hours last week

Erin worked 11 hours last week

bulgar [2K]3 years ago
3 0

Answer:

Sara worked for 28 hours last week.

Joan worked for 22 hours last week.

Erwin worked for 11 hours last week.

Step-by-step explanation:

Given :

Sara worked 28 hours last week.

Joan worked 6 hours less than Sara

Erin worked half as many hours as Joan.

To Find : How many hours did Sara, Joan, and Erin work last week?

Solution :

Since Sara worked for 28 hours last week .

And Joan worked for 6 hours less than Sara.

Then Joan worked for hours = 28-6 = 22 hours

Now we are also given that Erin worked for  half as many hours as Joan

So, Erin worked for hours = Joan hours /2 = 22/2 = 11 hours.

Thus, Sara worked for 28 hours last week.

Joan worked for 22 hours last week.

Erwin worked for 11 hours last week.



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Step-by-step explanation:

a)

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46.9  -1.50833 2.27507

49.4    0.99167 0.98340

50.3     1.89167 3.57840

49.8     1.39167 1.93674

48.8    0.39167 0.15340

47.0           -1.40833 1.98340

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49.4    0.99167  0.98340

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49.0    0.59167 0.35007

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s=\sqrt{\frac{16.7692}{12-1} }

s=\sqrt{\frac{16.7692}{11} }

s=\sqrt{1.5245}

s=1.2347

s=1.235 (rounded to 3 decimal places)

The standard deviation hardness value is 1.235.

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