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3 years ago

FACTORISE :4a^2 + a FACTORISE: FOUR A SQUARED PLUS A

Mathematics

1 answer:

Helen [10]3 years ago

5 0

Answer:

First we will select all terms in the expression

Terms=4a²,a

Then factor

Factor=4a²=4,a²

=a=a

Step-by-step explanation:

Pls mark as branliest thanks

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Let s be the standard deviation of data set.

Since 99.7% data fall within 3 standard deviations of mean, z-value for 47.5 and 62.5 has an absolute value of 3.

That is |z|=3

But z= $\frac{x-mean}{standard deviation}$

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That is $|\frac{47.5-55}{s}| = 3$

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Since x is always positive ( being standard deviation), $|\frac{-7.5}{s} | = \frac{|-7.5|}{s} = \frac{7.5}{s}$

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Hence standard deviation of data set is 2.5.

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