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zheka24 [161]
3 years ago
8

The probability that a random smoker will develop a sever lung condition during his or her lifetime is 0.3. we will choose a ran

dom sample of 120 smokers and let x be the number of these smokers that will develop a severe lung condition.
a.in our sample, find the mean and standard deviation of the number of smokers that will develop a sever lung condition. give your answers to two decimal plac
Mathematics
1 answer:
postnew [5]3 years ago
8 0
The mean is 36 and the standard deviation is 5.02.

The mean is given by
μ = np = 120*0.3 = 36.

The standard deviation is given by
σ = √(n*p*(1-p)) = √(120*0.3*0.7) = √25.2 = 5.02.
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Find the product of 21 and (6.3 • 10-4)
mrs_skeptik [129]
It would be: 21 * (6.3 * 10⁻⁴)
= 132.3 * 10⁻⁴
= 1.323 * 10⁻²

In short, Your Answer would be: 1.323 * 10⁻²

Hope this helps!
5 0
3 years ago
Math problem need help if do 5 stars
NNADVOKAT [17]

Answer:

The ordered pair (15, 12) means that 15 pounds of beans cost $12.

Step-by-step explanation:

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4 0
2 years ago
Help needed I need the answer with work shown for the graphs
andreyandreev [35.5K]

top left: speed = 2.7 miles per hour  = 2.7 MPH

top right: speed = 0 miles per hour  = 0 MPH

bottom left: speed = 4 miles per hour  = 4 mi/h

bottom right: speed = 2 miles per hour  = 2 mi/h

and so, the fastest is bottom left. And pay attention in class! i'm in highschool and Iearned this in 6th grade!

Step-by-step explanation:

key: speed= distance/time

distance= speedxtime

time=distance/speed

top left: 8/3= 2.66667 MPH= 2.7 MPH

top right: 0/8= 0 MPH= 0 MPH

bottom left: 8/2= 4 MPH= 4 MPH

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6 0
3 years ago
How do I write an algebraic equation for this word problem?
Doss [256]
Hi.

Please note that I haven't done much algebra.

4 more = 4 +

Twice as many than the runner up means 2 times the amount they ate (a variable) = 2n

So far we have 4 + 2n

Since it's an equation, we are going to know what it equals. In the problem, we find out that it's 11. So the equation looks like this:

4 + 2n = 11

If this didn't work out, please let me know.

~

I believe n = 3.5
7 0
3 years ago
Can some one helppppppppppp
alexdok [17]

Answer:

66 ft

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L ∝ n

L = kn , k -> number of sections

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n = 6 ft

Length of 1 section of fence = 6 ft

Length of 11 sections of fence = 6* 11 = 66 ft

5 0
3 years ago
Read 2 more answers
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