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Gelneren [198K]
3 years ago
7

What effect does blocking by gender have on the standard deviation of recumbent length for each​ gender?

Mathematics
1 answer:
jek_recluse [69]3 years ago
3 0
The standard deviation is lower for each group than it is for the groups combined.
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Solve for a. <br> a = 0<br> a = -1<br> a = 1<br> none
Jobisdone [24]

Answer:

None.

Step-by-step explanation:

5/a - 2 / (1 - a) = 2 (a - 1)

Multiply each term by  a(1 - a)(a - 1):

5 (1 - a)(a - 1) - 2a(a - 1)  = 2a(1 - a)

5( a - 1 - a^2 + a)  - 2a^2 + 2a = 2a - 2a^2

5(-a^2 +  2a  - 1) - 2a^2 + 2a = 2a - 2a^2

-5a^2 + 10a - 5 - 2a^2 + 2a - 2a + 2a^2 = 0

-5a^2 + 10a - 5 = 0

-5(a^2 - 2a + 1) = 0

= -5(a - 1)^2 = 0

So a = 1.

But a = 1 cannot be a root because 2/ 1 - a would be 2/0 which is undefined.

Also 2 / (a - 1) is undefined.

6 0
3 years ago
Glenn budgets 1/6 of his weekly allowance for entertainment. Glenn's entertainment bill is 29. What is his weekly allowance?
Nadusha1986 [10]
For this case, as you've got 1/6th, this will then mean that you have to multiply the bill (29) by 6, therefore, giving you 174. Glenn's weekly allowance is $174
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Step-by-step explanation:

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Solve for x: -3 + 4x = 25
EleoNora [17]

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Step-by-step explanation:

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