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3 years ago

Mr.roberts wrote 4 statements on the board and asked the class which one was true .which of the following is true

Mathematics

1 answer:

artcher [175]3 years ago

3 0

The answer is always true because the truth never lies

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How is 5.35 one-half of the way between 2.2 and 8.5? Can someone please help me to understand?

Aleks04 [339]

Answer:

because it is in the middle of 2.2 and 8.5

so if you split it up 2.2 and 8.5 take 3.15 from 8.5 and give it to 2.2 now u have 5.35 as your answer.

Hope this helped

6 0

3 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

How many centimeters are there in 1.23 x 10 to the negative 6th power

pashok25 [27]

I think the answer is <span>0.123 cm</span>

4 0

3 years ago

Rectangle LMNO is reflected over the x-axis to create rectangle L'M'N'O'. If a line segment is drawn from point M to point M', w

trasher [3.6K]

Answer:I am pretty sure the answer is

C. "They are perpendicular to each other."

Step-by-step explanation:

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3 years ago

Read 2 more answers

Problem #2 A, B,C,D,E

PilotLPTM [1.2K]

2x+4

2(x+4)

(x/5)+6

(x+6)squared

X-5/x

4 0

4 years ago

Read 2 more answers