3 years ago

If n=4 the value of the expression 28-12+ square root of n divided by 2 is____.

1 answer:

Ann [662]3 years ago

4 0

C 17/2 hope this helps you

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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:

$E=\#weeks*P(S>120)=52*0.09012=4.68$

The nearest answer is C. 5 weeks.

6 0

2 years ago

BartSMP [9]

14. 128
15.25
16.90
those should be right

6 0

2 years ago

levacccp [35]

Answer:
The irrational number between 5.5 and 5.2 is square root of 30.

6 0

3 years ago

lisov135 [29]

Check the picture below.

make sure your calculator is in Degree mode.

6 0

3 years ago

Dmitriy789 [7]

By the Pythagorean theorem:

 $third \ side = \sqrt{74^2-24^2} = \sqrt{5476-576}= \sqrt{4900}=70 \ in$

4 0

2 years ago