Can someone help on this other question ^W^

Mathematics

2 answers:

Dvinal [7]3 years ago

6 0

Answer:

$\huge\boxed{z=12}$

Step-by-step explanation:

$\dfrac{z}{4}-2=1\qquad|\text{add 2 to both sides}\\\\\dfrac{z}{4}-2+2=1+2\\\\\dfrac{z}{4}=3\qquad|\text{multiply both sides by 4}\\\\4\!\!\!\!\diagup\cdot\dfrac{z}{4\!\!\!\!\diagup}=4\cdot3\\\\z=12$

Ket [755]3 years ago

5 0

Answer:

z=12

Step-by-step explanation:

z/4-2=1

z/4=2+1

z/4=3

z=3×4

z=12

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a previous analysis of paper boxes showed that the standard deviation of the length is 9mm. What is the 98% confidence interval

il63 [147K]

We cannot calculate the confidence interval without the sample size. However, for the second question, the sample size needed would be 49.

The formula we use is

$n=(\frac{z_{\frac{\alpha}{2}}\times \sigma}{E})^2$

To find the z-score:
Convert 98% to a decimal: 0.98
Subtract from 1: 1-0.98 = 0.02
Divide by 2: 0.02/2 = 0.01
Subtract from 1: 1-0.01 = 0.99

Using a z-table (http://www.z-table.com) we see that this value is closest to a z-score of 2.33.

Using the z-score, our standard deviation (9) and our margin of error (3), we have:
$n=(\frac{2.33(9)}{3})^2=(6.99)^2=48.86\approx 49$

6 0

3 years ago

What does A equal? •1 •4 •58

IRINA_888 [86]

Answer:

a=4

Step-by-step explanation:

if a+5=2a+1

then 5-1 = 2a-a

so 4 = a

4 0

3 years ago