125 X 16 Please provide working out. lol help a fellow kid out.

Mathematics

1 answer:

Elis [28]4 years ago

5 0

For the first one just do the multiplication as you do normally.
For the second one, you have to put a zero behind before calculating the numbers in front

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A set of data with 1200 numbers is normally distributed with a mean of 27 and a standard deviation of 4. How many numbers in the

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Step-by-step explanation:

The mean is 27 and the standard deviation is 4.

23 is 1 standard deviation below the mean, and 31 is 1 standard deviation above the mean. According to the empirical rule, 68% of the population is between -1 and +1 standard deviations.

68% of 1200 is 816.

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Given the sequence in the table below, determine the sigma notation of the sum for term 4 through term 15

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$a_n=5 \ for \ n=1 \\
a_n=-10 \ for \ n=2 \\
a_n=20 \ for \ n=3$

You can see it's a geometric sequence because the ratio is constant ( $\frac{a_3}{a_2}=\frac{a_2}{a_1}$ ).
The nth term of a geometric sequence:
$a_n=a_1 \times r^{n-1}$

$a_1=5 \\
r=\frac{a_2}{a_1}=\frac{-10}{5}=-2 \\ \\
a_n=5(-2)^{n-1}$

It has to be the sum for term 4 through term 15, so n=4 and the number above the sigma is 15.

Your answer:
$\sum^{15}_{n=4} 5(-2)^{n-1}$

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I am also indian i know this solution if you want to know commet here

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