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ololo11 [35]
3 years ago
12

= n + 3} " alt=" \sqrt {4n + 8 = n + 3} " align="absmiddle" class="latex-formula">
help please
​
Mathematics
1 answer:
Vsevolod [243]3 years ago
5 0

the answer is

n =  - 1

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Using the given information, the value of Σfd is 800

<h3>Calculating mean using Assumed mean </h3>

From the question, we are to determine the value of Σfd

The formula for mean, using the assumed mean method is given by

\bar x = A + \frac{\sum fd}{\sum f}

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From the given information,

\bar x = 80

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Putting the parameters into the equation, we get

80 = 60 + \frac{\sum fd}{40}

80-60 = \frac{\sum fd}{40}

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\sum fd = 20 \times 40

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Learn more on Mean here: brainly.com/question/20118982

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