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3 years ago

HELLPP! This is all the math homework I have. I'm nowhere near good at math and need help.

Mathematics

2 answers:

VashaNatasha [74]3 years ago

6 0

Where is the picture ??--------

Lisa [10]3 years ago

4 0

What are some of the questions you need help on?

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What ratios are equal to 10:15

Zielflug [23.3K]

Answer:

It is 2/3

Step-by-step explanation:

Divide 10 and 15 by 5 to get 2:3

7 0

3 years ago

Calculate the sample standard deviation and sample variance for the following frequency distribution of heart rates for a sample

adelina 88 [10]

Answer:

$\sigma = 12.5$ ---- sample standard deviation

$\sigma^2 = 157.2$ ---- sample variance

Step-by-step explanation:

Solving (a): The sample variance

First, we calculate the midpoint of each class (this is the average of the limits)

So, we have:

$x_1 = \frac{56 + 64}{2} = 60$

$x_2 = \frac{65 + 73}{2} = 69$

And so on

So, the table becomes:

$\begin{array}{cc}{x} & {f} & {60} & {11} & {69} & {15} & {78} & {14} & {87} & {4} & {96} & 11 \ \end{array}$

Calculate the mean

$\bar x = \frac{\sum fx}{\sum f}$

$\bar x = \frac{60*11+69*15+78*14+87*4+96*11}{11+15+14+4+11}$

$\bar x = \frac{4191}{55}$

$\bar x = 76.2$

The variance is:

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

So, we have:

$\sigma^2 = \frac{(60 - 76.2)^2*11+(69 - 76.2)^2*15+(78 - 76.2)^2 *14+(87 - 76.2)^2*4+(96 - 76.2)^2*11}{11+15+14+4+11-1}$

$\sigma^2 = \frac{8488.8}{54}$

$\sigma^2 = 157.2$

The sample standard deviation is:

$\sigma = \sqrt{\sigma^2$

$\sigma = \sqrt{157.2$

$\sigma = 12.5$

Solving (b): The sample variance

In (a), we calculate the sample variance to be:

$\sigma^2 = 157.2$

6 0

3 years ago

Question is in the picture:::

Leviafan [203]

Answer:

160

Have a great day!

6 0

3 years ago

What would be the value of 8 if it were in the thousands

N76 [4]

It would be 8,000 it's simple hope i could help

3 0

3 years ago

Read 2 more answers

Find the surface Jenna Haik 3/8 Mile and 1/4 hour. how fast did she hike in miles per hour?

Eduardwww [97]

If you meant to state that Jenna hiked 3/8 mile in 1/4 hour, then we can convert that to miles per hour:

3
-- mile
8
---------- = (3/8) / (1/4) mph = 12/8 mph, or 3/2 mph, or 1.5 mph (answer)
1
-- hour
4

4 0

3 years ago