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otez555 [7]
4 years ago
8

If you are adding two fractions that are both greater than 1/2, what must be true about the sum? Give three examples to support

your thinking
Mathematics
1 answer:
slavikrds [6]4 years ago
3 0

Answer:

The sum must be greater than 1

Step-by-step explanation:

Two fractions that are greater than 1/2 let's say

<u>Example 1</u>

3/4 and 7/8, the sum will be

3/4+7/8 with LCM of denominator as 8 sum=\frac {(3*2)+7}{8}=\frac {13}{8}=1\frac {5}{8} which is more than 1

<u>Example 2</u>

6/9 and 5/8 with the LCM of denominator as 72, the sum=\frac {(6*8)+(5*9)}{72}=\frac {93}{72}=1\frac {7}{24} which is greater than 1

<u>Example 3</u>

8/9 and 7/9 with the LCM of denominator as 9, the sum=\frac {8+7}{9}=\frac {15}{9}=1\frac {2}{3} which is greater than 1

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One of your peers claims that boys do better in math classes than girls. Together you run two independent simple random samples
JulijaS [17]

Answer:

Step-by-step explanation:

Hello!

To test if boys are better in math classes than girls two random samples were taken:

Sample 1

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Sample 2

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n₂= 12

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S₂= 6.7%

To estimate per CI the difference between the mean percentage that boys obtained in calculus and the mean percentage that girls obtained in calculus, you need that both variables of interest come from normal populations.

To be able to use a pooled variance t-test you have to also assume that the population variances, although unknown, are equal.

Then you can calculate the interval as:

[(X[bar]_1-X[bar_2) ± t_{n_1+n_2-2;1-\alpha /2} * Sa*\sqrt{\frac{1}{n_1} +\frac{1}{n_2} }]

Sa= \sqrt{\frac{(n_1-1)S^2_1+(n_2-1)S^2_2}{n_1+n_2-2} } = \sqrt{\frac{14*(5.6^2)+11*(6.7^2)}{15+12-2} }= 6.108= 6.11

t_{n_1+n_2-2;1-\alpha /2}= t_{15+12-2;1-0.05}= t_{25;0.95}= 1.708

[(82.3-81.2) ± 1.708* (6.11*\sqrt{\frac{1}{15}+\frac{1}{12}  }]

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Using a 90% confidence level you'd expect the interval [-2.94; 5.14] to contain the true value of the difference between the average percentage obtained in calculus by boys and the average percentage obtained in calculus by girls.

I hope this helps!

3 0
3 years ago
Simplify.<br> 1/4(3x-7)+3/4x
Ivan

Answer:

C. 1\frac{1}{2} x - 1\frac{3}{4}

Step-by-step explanation:

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