The solution to the problem is as follows:
2x² - 7x = 3 can be re-written as 2x² - 7x - 3 = 0
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Either by completing the square or using the quadratic formula this can be solved . </span>
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Let's complete the square. </span>
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2x² - 7x - 3 = 2(x² - 3.5x - 1.5) = 2(x - 1.75)² - 9.125....then we can put </span>
2(x - 1.75)² = 9.125 : (x - 1.75)² = 9.125/2 = 4.5625
x - 1.75 = √4.5625 ≈ ± 2.14
<span>x = 1.75 ± 2.14 .....thus x ≈ 3.89 and x ≈ - 0.39
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The variance for the sample is 25
For given question,
We have been given the sample size n = 21
and the sum of squares is SS = 500
We need to find the variance for the sample.
We know that the variance is mathematically represented as,
Substituting given values in the above formula,
= 500 / 20
= 25
So, the variance is 25
Therefore, the variance for the sample is 25
Learn more about the variance here:
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Answer:
115.909091
Step-by-step explanation:
12 3/8 turn the 1/4 into 2/8 and add that to 1/8 and you get 3/8. add 5 and 7 to get 12.
Answer:
It will take 20 years
Step-by-step explanation:
Work out the 60 % (1300*0.6=780)
Work out the rate of it decreasing (1300*0.02=26)
Do 1300 - 780 = 520
Do 520 / 26 = 20
