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g100num [7]
3 years ago
7

Adam got 56 out of 84 correct in his test. What fraction of the marks did he get correct

Mathematics
2 answers:
Nina [5.8K]3 years ago
8 0

Answer:

56/84

Step-by-step explanation:

Adam had 84 questions, and out of 84, he got 56 right.

<em>Out of</em>  just indicates a fraction.

You would then translate:

x/84

If x is how many he got right, you would then substitute in 56:

56/84

:)

kondor19780726 [428]3 years ago
7 0

56/84 or 2/3

Hope this helped!

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svet-max [94.6K]

Answer:

90% confidence interval for the proportion of all US adults ages 55 to 64 to use online dating is [0.095 , 0.148].

Step-by-step explanation:

We are given that a survey conducted in July 2015 asked a random sample of American adults whether they had ever used online dating.

The survey included 411 adults between the ages of 55 and 64, and 50 of them said that they had used online dating.

Firstly, the pivotal quantity for 90% confidence interval for the population proportion is given by;

                                P.Q. =  \frac{\hat p-p}{\sqrt{\frac{\hat p(1-\hat p)}{n} } }  ~ N(0,1)

where, \hat p = sample proportion of adults who said that they had used online dating =  \frac{50}{411}  = 0.122

n = sample of adults between the ages of 55 and 64 = 411

p = population proportion of all US adults ages 55 to 64 to use online dating

<em>Here for constructing 90% confidence interval we have used One-sample z proportion statistics.</em>

<u>So, 90% confidence interval for the population proportion, p is ;</u>

P(-1.645 < N(0,1) < 1.645) = 0.90  {As the critical value of z at 5% level

                                                  of significance are -1.645 & 1.645}  

P(-1.645 < \frac{\hat p-p}{\sqrt{\frac{\hat p(1-\hat p)}{n} } } < 1.645) = 0.90

P( -1.645 \times {\sqrt{\frac{\hat p(1-\hat p)}{n} } } < {\hat p-p} < 1.645 \times {\sqrt{\frac{\hat p(1-\hat p)}{n} } } ) = 0.90

P( \hat p-1.645 \times {\sqrt{\frac{\hat p(1-\hat p)}{n} } } < p < \hat p+1.645 \times {\sqrt{\frac{\hat p(1-\hat p)}{n} } } ) = 0.90

<u>90% confidence interval for p</u> = [\hat p-1.645 \times {\sqrt{\frac{\hat p(1-\hat p)}{n} } }, \hat p+1.645 \times {\sqrt{\frac{\hat p(1-\hat p)}{n} } }]

= [ 0.122-1.645 \times {\sqrt{\frac{0.122(1-0.122)}{411} } } , 0.122+1.645 \times {\sqrt{\frac{0.122(1-0.122)}{411} } } ]

 = [0.095 , 0.148]

Therefore, 90% confidence interval for the proportion of all US adults ages 55 to 64 to use online dating is [0.095 , 0.148].

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Step-by-step explanation:

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Answer: y = 90   x = 29

Step-by-step explanation:

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The larger number is (-7+14)/2 = 3.5.

The smaller number is (-7-14)/2 = -10.5.

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The two equations a+b=-7, a-b=14 can be solved to get these results. It is genrally convenient to solve them by adding one to the other, or subtracting one from the other.

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Step-by-step explanation:

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