Ask question

Ask question

All categories

2 years ago

7

Leanne multiplied 8x4.3 and got 32.24

2 answers:

Illusion [34]2 years ago

7 0

<span>8 x 4.3 = 34.4
//////////////////////</span>

Ket [755]2 years ago

3 0

The correct answer is 34.4

You might be interested in

The estimated daily living costs for an executive traveling to various major cities follow. The estimates include a single room

Alexandra [31]

Answer:

$\bar x = 260.1615$

$\sigma = 70.69$

The confidence interval of standard deviation is: $53.76$ to $103.25$

Step-by-step explanation:

Given

$n =20$

See attachment for the formatted data

Solving (a): The mean

This is calculated as:

$\bar x = \frac{\sum x}{n}$

So, we have:

$\bar x = \frac{242.87 +212.00 +260.93 +284.08 +194.19 +139.16 +260.76 +436.72 +355.36 +.....+250.61}{20}$

$\bar x = \frac{5203.23}{20}$

$\bar x = 260.1615$

$\bar x = 260.16$

Solving (b): The standard deviation

This is calculated as:

$\sigma = \sqrt{\frac{\sum(x - \bar x)^2}{n-1}}$

$\sigma = \sqrt{\frac{(242.87 - 260.1615)^2 +(212.00- 260.1615)^2+(260.93- 260.1615)^2+(284.08- 260.1615)^2+.....+(250.61- 260.1615)^2}{20 - 1}}$ $\sigma = \sqrt{\frac{94938.80}{19}}$

$\sigma = \sqrt{4996.78}$

$\sigma = 70.69$ --- approximated

Solving (c): 95% confidence interval of standard deviation

We have:

$c =0.95$

So:

$\alpha = 1 -c$

$\alpha = 1 -0.95$

$\alpha = 0.05$

Calculate the degree of freedom (df)

$df = n -1$

$df = 20 -1$

$df = 19$

Determine the critical value at row $df = 19$ and columns $\frac{\alpha}{2}$ and $1 -\frac{\alpha}{2}$

So, we have:

$X^2_{0.025} = 32.852$ ---- at $\frac{\alpha}{2}$

$X^2_{0.975} = 8.907$ --- at $1 -\frac{\alpha}{2}$

So, the confidence interval of the standard deviation is:

$\sigma * \sqrt{\frac{n - 1}{X^2_{\alpha/2} }$ to $\sigma * \sqrt{\frac{n - 1}{X^2_{1 -\alpha/2} }$

$70.69 * \sqrt{\frac{20 - 1}{32.852}$ to $70.69 * \sqrt{\frac{20 - 1}{8.907}$

$70.69 * \sqrt{\frac{19}{32.852}$ to $70.69 * \sqrt{\frac{19}{8.907}$

$53.76$ to $103.25$

8 0

2 years ago

$22.95 shirt. 6% tax

lina2011 [118]

Answer:

6%=0.06

y=22.95(0.06)

y=1.377

y=1.377+22.95

$24.327 = $24.33 is the total for the shirt after tax.

Step-by-step explanation:

4 0

2 years ago

What is the sum of 21 and 5 times a number f is 61

sukhopar [10]

Answer:

Answer is below

Step-by-step explanation:

21 + 5f = 61 Turn the words into an equation

-21 - 21 Subtract 21 from both sides

5f = 40 Divide both sides by 5

f = 8

If this answer is correct, please make me Brainliest!

5 0

3 years ago

Read 2 more answers

Autumn is making a fruit salad. Peaches cost 0.75 each and blueberries cost $1.50 a package. Autumn spends 11.25 dollars and buy

Harman [31]

5 peaces and 5 blueberry packages 0.75*5=3.75. 1.50*5=7.5. 3.75+7.5=11.25

6 0

3 years ago

Read 2 more answers

On new years Eve,The temperature fell by 24 degrees in a span of 6 hours by how many degrees did the temperature fall every hour

RoseWind [281]

Answer:

4 degrees

Step-by-step explanation:

24 degrees :6 hours

divide by 6 for the unit rate.

4 degrees : 1 hour

5 0

2 years ago

Read 2 more answers