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Ugo [173]
3 years ago
5

What is the probability that a person who is older than 35 years has a hemoglobin level between 9 and 11?

Mathematics
1 answer:
prohojiy [21]3 years ago
5 0

There are some numbers missing in your table. We think the values are supposed to be the ones shown in the attachment.

The number of people that are older than 35 and have a hemoglobin level between 9 and 11 is 46. The total number of people older than 35 is 162, so the proportion of people older than 35 with the hemoglobin level of interest is ...

... 46/162 ≈ 0.284

The appropriate choice is B. 0.284.

_____

<em>Here's how you get there with the formula for conditional probability.</em>

P(9-11 | >35) = P(9-11 & >35)/P(>35) . . . . conditional probability formula

P(9-11 | >35) = (46/429) / (162/429) = 46/162

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What is the second term in the binomial expansion of (2r-3s)12?
Reptile [31]
(a+b)^n=\displaystyle\sum_{k=0}^n\binom nka^{n-k}b^k

where \dbinom nk=\dfrac{n!}{k!(n-k)!}. The second term of the expansion occurs when k=1.

So the second term of the expansion of (2r-3s)^{12} is

\dbinom{12}1(2r)^{12-1}(-3s)^1=12(2r)^{11}(-3s)=-73728r^{11}s
5 0
3 years ago
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The point (2,–5), when reflected across the origin, maps onto the point _______. answers : (–5,2) (5,–2) (–2,5) (2,5)
Inessa [10]

Answer:

(-2, 5)

Step-by-step explanation:

A reflection across the origin turns the point (a, b) into (-a, -b).

6 0
3 years ago
Can i get some help :
Charra [1.4K]

Answer:

b = \frac{7}{12}

Step-by-step explanation:

b + \frac{2}{3} = 1 \frac{1}{4} ← change to an improper fraction

b + \frac{2}{3} = \frac{5}{4}

Multiply through by 12 ( the LCM of 3 and 4 ) to clear the fractions

12b + 8 = 15 ( subtract 8 from both sides )

12b = 7 ( divide both sides by 12 )

b = \frac{7}{12}

5 0
2 years ago
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Which value is a discontinuity of x^2+7x+1/x^2+2x-15? x=-1 x=-2 x=-5 x=-4
dsp73
\dfrac{x^2+7x+1}{x^2+2x-15}=\dfrac{x^2+7x+1}{(x+5)(x-3)}

which is undefined when x=-5 or x=3. The answer is then the third choice.
6 0
3 years ago
PLS HELP ASAP FIRST CORRECT ANSWER GETS BRAINLIEST​
Anna11 [10]
Using Pythagorean, a^2 + b^2 = c^2
16 +x^2 = 36.69
Then subtract the 16 from 36.69, which is 23.69
And finally take the square root of that, giving you 4.87
6 0
2 years ago
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