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3 years ago

11

Which of the fractions is in lowest terms and is equivalent to -1.25

1 answer:

hjlf3 years ago

7 0

Answer:

The lowest terms equivalent to - 1.25 = - $\frac{5}{4}$

Step-by-step explanation:

- 1.25 = - $1\frac{25}{100}$

= - ( 1 × 100 +25) ÷ 100

= -( $\frac{125}{100}$ ) × ( $\frac{5}{5}$

= - $\frac{25}{20}$

= - ( $\frac{25}{20}$ ) × ( $\frac{5}{5}$

= - $\frac{5}{4}$

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And we know that the margin of erro is given by:

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We have all the values except the value for $z_{\alpha/2}$

So we can find it like this:

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And solving for $z_{\alpha/2}$ we got:

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And we can find the value for $\alpha/2$ with the following excel code:

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And we got $\alpha/2 =0.01$ so then the value for $\alpha=0.02$ and then the confidence level is given by: $Conf=1-0.02=0.98$ or 98%

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