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2 years ago

The ratio of boys to girls in a group is 7:2. If there are 65 more boys than girls, work out how many boys there are.

Mathematics

2 answers:

kicyunya [14]2 years ago

6 0

低于当地人民：或立场上有一些事情了！儿女情长的好了吗我想做出

valentina_108 [34]2 years ago

4 0

Answer:

91 boys

Step-by-step explanation:

Given that the ratio of boys to girls = 7 : 2 = 7x : 2x ( x is a multiplier )

There are 65 more boys than girls , thus

7x = 2x + 65 ( subtract 2x from both sides )

5x = 65 ( divide both sides by 5 )

x = 13

There are 7 × 13 = 91 boys in the group

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svetlana [45]

Answer:

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Step-by-step explanation:

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So, the total cost of $s$ student tickets $=\$3s$ and the total cost of $t$ other tickets $=\$5t$

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anzhelika [568]

Answer:

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Step-by-step explanation:

The Central Limit Theorem estabilishes that, for a normally distributed random variable X, with mean $\mu$ and standard deviation $\sigma$ , the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean $\mu$ and standard deviation $s = \frac{\sigma}{\sqrt{n}}$ .

For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.

For proportions, the mean is $\mu = p$ and the standard deviation is $s = \sqrt{\frac{p(1-p)}{n}}$

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The mean of the sampling distribution of the sample proportions is 0.82 and the standard deviation is 0.0256.

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Answer:

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Answer:

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