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2 years ago

2/3 divided by 1/4 ill give brainliest

Mathematics

2 answers:

Dafna11 [192]2 years ago

5 0

Answer

2 2/3

Step-by-step explanation:

2/3 : 1/4
i usually to the keep change flip method:
2/3 x 4/1
8/3

2 2/3

Virty [35]2 years ago

4 0

2/3 ÷ 1/4

2/3 ×4/1 (by reciprocal)

2/3 × 4

8/3

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2 years ago

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3 years ago

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2 years ago

Two college roommates have each committed to donating to charity each week for the next year. The roommates’ weekly incomes are

schepotkina [342]

Answer:

C. 5 weeks.

Step-by-step explanation:

In this question we have a random variable that is equal to the sum of two normal-distributed random variables.

If we have two random variables X and Y, both normally distributed, the sum will have this properties:

$S=X+Y\\\\\ \mu_S=\mu_X+\mu_Y=30+60=90\\\\\sigma_S=\sqrt{\sigma_X^2+\sigma_Y^2}=\sqrt{10^2+20^2}=\sqrt{100+400}=\sqrt{500}=22.36$

To calculate the expected weeks that the donation exceeds $120, first we can calculate the probability of S>120:

$z=\frac{S-\mu_S}{\sigma_S} =\frac{120-90}{22.36}=\frac{30}{22.36}=1.34\\\\P(S>120)=P(z>1.34)=0.09012$

The expected weeks can be calculated as the product of the number of weeks in the year (52) and this probability:

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The nearest answer is C. 5 weeks.

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2 years ago

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3 years ago

Read 2 more answers