All categories

3 years ago

6x (-3) I don’t understand I need answer

Mathematics

1 answer:

zepelin [54]3 years ago

3 0

Answer:

Step-by-step: 6x(-3)

6x•(-3)

=3x

You might be interested in

K=6x+10, solve for k

kicyunya [14]

Answer:

x=(10-k)÷6

Step-by-step explanation:

6x=10-k

x=(10-k)÷6

4 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

2 years ago

I need answers for these geometrical things<br> Yeah

Hunter-Best [27]

I really don't even know this this app literally
only gives you like 2 answers at a time.

7 0

2 years ago

Solve 5x4/9. help pleeeeaaassee

Rus_ich [418]

Answer:

$\sf \: 2 \frac{2}{9}$

Step-by-step explanation:

Q) 5 × (4/9) = ?

→ (5 × 4)/9

→ 20/9

$\rightarrow\sf \: 2 \frac{2}{9}$

8 0

2 years ago

Read 2 more answers

The cost of a long distance call is $1.25 for the

Vinil7 [7]

C

For first 3 minutes keep 1.25
Then for rest do 0.15(x-3)
Now add to get total cost

Mark brainliest please

8 0

3 years ago

Read 2 more answers