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3 years ago

Can someone pleas Help me with this I don't get it. And Thank you o much if you helped me.

Mathematics

2 answers:

agasfer [191]3 years ago

8 0

Answer: 20=96 40=192 60=288

Step-by-step explanation:

satela [25.4K]3 years ago

8 0

Answer:

20 shirts cost 96.00

40 shirts cost 192.00

60 shirts cost 288.00

Step-by-step explanation:

Multiply 4.80( per shirt) with the amount of shirts you have

Plz brainly

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3 years ago

Please check my answer: Find the equation of the line that has a slope of -8 and a y-intercept of 2. Answer 4x+y-5

LUCKY_DIMON [66]

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4 years ago

I have to identify the slop and the y intercept.<br> 3x-y=5 I have to find M and B

Maru [420]

Answer:

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Step-by-step explanation:

Use the slope-intercept form y = m x + b to find the slope m and y-intercept b .

3 0

3 years ago

Read 2 more answers

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BigorU [14]

Answer:

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8 0

4 years ago

Calculate the sample mean and sample variance for the following frequency distribution of heart rates for a sample of American a

spin [16.1K]

Answer:

$Mean = 68.9$

$s^2 =18.1$ --- Variance

Step-by-step explanation:

Given

$\begin{array}{cccccc}{Class} & {51-58} & {59-66} & {67-74} & {75-82} & {83-90} \ \\ {Frequency} & {6} & {3} & {11} & {13} & {4} \ \end{array}$

Solving (a): Calculate the mean.

The given data is a grouped data. So, first we calculate the class midpoint (x)

For 51 - 58.

$x = \frac{1}{2}(51+58) = \frac{1}{2}(109) = 54.5$

For 59 - 66

$x = \frac{1}{2}(59+66) = \frac{1}{2}(125) = 62.5$

For 67 - 74

$x = \frac{1}{2}(67+74) = \frac{1}{2}(141) = 70.5$

For 75 - 82

$x = \frac{1}{2}(75+82) = \frac{1}{2}(157) = 78.5$

For 83 - 90

$x = \frac{1}{2}(83+90) = \frac{1}{2}(173) = 86.5$

So, the table becomes:

$\begin{array}{cccccc}{x} & {54.5} & {62.5} & {70.5} & {78.5} & {86.5} \ \\ {Frequency} & {6} & {3} & {11} & {13} & {4} \ \end{array}$

The mean is then calculated as:

$Mean = \frac{\sum fx}{\sum f}$

$Mean = \frac{54.5*4+62.5*3+70.5*11+78.5*13+86.5*4}{6+3+11+13+4}$

$Mean = \frac{2547.5}{37}$

$Mean = 68.9$ -- approximated

Solving (b): The sample variance:

This is calculated as:

$s^2 =\frac{\sum (x - \overline x)^2}{\sum f - 1}$

So, we have:

$s^2 =\frac{(54.5-68.9)^2+(62.5-68.9)^2+(70.5-68.9)^2+(78.5-68.9)^2+(86.5-68.9)^2}{37 - 1}$

$s^2 =\frac{652.8}{36}$

$s^2 =18.1$ -- approximated

5 0

3 years ago