1 year ago

A population has a standard deviation of 7.89. what is the approximate standard error of the mean for a sample size of 300?

Mathematics

1 answer:

scoundrel [369]1 year ago

6 0

Answer:

Below.

Step-by-step explanation:

Standard error =

standard deviation / √n

= 7.89 / √300

= 0.456 approx.

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2 years ago

What two numbers add to 9 and multiply to -70

Alborosie

X, y - the numbers

The numbers add to 9 and multiply to -70.
$x+y=9 \\
xy=-70 \\ \\
y=9-x \\
xy=-70 \\ \\
\hbox{substitute 9-x for y in the second equation:} \\
x(9-x)=-70 \\
9x-x^2=-70 \\
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