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ss7ja [257]
3 years ago
8

Uhhh what????????????

Mathematics
2 answers:
nalin [4]3 years ago
8 0
Calculate volumes

v=lwh
vinitial=6*5*5=150
vnew=6*15*15=1350

new/initial=1350/150=9

9 times
Hunter-Best [27]3 years ago
4 0

Answer:

i don't understand lol

                           Sincerely, Now feeling dumb me

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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
Determine whether a quadratic model exists for each set of values. If so, write the model.
zvonat [6]
 Yes, a quadratic model does exist and its equation is f(x)=4x^2
6 0
3 years ago
A bag contains 3 yellow, 1 red, 2 green beads. Charlene draws a bead, keeps it out, then draws another bead. What’s the probabil
CaHeK987 [17]
Charlene had more green then red.

so She will run out of red first anyways because its the lowest amount. 

Hope this helps....
5 0
3 years ago
I need help with this please
alexdok [17]

Answer:

polygons

Step-by-step explanation:

this is a hexagon so the sum of interior angles is 720. so add all of those angles and expressions and set it equal to 720. collect like terms and solve for x

once you have x, evaluate and get the exact angle measurements.

8 0
2 years ago
Write a multiplication equation with 1/2 as a factor (EXPLAIN)
jolli1 [7]

16 BECAUSE YOU  ADD THE CUT UP APPLES AND MAKE IT A FRACTION
4 0
3 years ago
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