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Bond [772]
3 years ago
6

Each of 8 students reported the number of movies they saw in the past year. This is what they reported: 16, 12, 13, 14, 19, 13,

17, 13 Find the mean and median number of movies that the students saw. If necessary, round your answers to the nearest tenth.
Mathematics
2 answers:
Bezzdna [24]3 years ago
8 0

Answer:

The median is the average of all the numbers so you would first add all the numbers together which is 16+12+13+14+19+13+17+13=117

then you divide 117/8=14.6

Then your median is the middle number of all your numbers in numerical order

12, 13, 13, 13, 14, 16, 17, 19

which is 13 and 14, and between those two numbers is 13.5

Step-by-step explanation:

allsm [11]3 years ago
7 0

Answer:

Mean: 14.6

Median: 13.5

Step-by-step explanation:

To find the mean, add up all the numbers and divide by the amount of terms:

\frac{16+12+13+14+19+13+17+13}{8}=\frac{117}{8} =14.625

To find the median, order the numbers from least to greatest and take the center term:

12, 13, 13, 13, 14, 16, 17, 19

If there is an even number of terms, average the middle two:

\frac{13+14}{2}=13.5

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Answer:

Time= 10 years

Step-by-step explanation:

Let total time=t

Initial Amount=5000

Final Amount=10000

Total interest = Final Amount - Initial Amount

                      =10000-5000\\=5000

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Use a calculator to find the standard deviation of this data set: 8, 14, 12, 9, 16
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Mary is the last person to get on a ferris wheel ride at a fair (the ride begins once she is on). The ferris wheel has a radius
Aleks [24]

Answer:

a) For sketch see attached picture.

 y=-8cos(\pi t)+10

b) Mary will be able to enjoy the scenery for a total of 1.68 min or about 101 seconds.

Step-by-step explanation:

a) In order to find the algebraic representation of the problem, we must start by drawing a sketch of what the problem looks like (see attached picture). Next, we can analyze it to see what function better fits the situation. In this case, since the ride starts at the lowest point, then we are talking about a negative cos function. A cos function has the followng general form:

y= Acos(\omega t - \phi) + C

where:

A= amplitude

\omega=angular speed

t=time

\phi= phase shift

C= vertical shift.

In this case the amplitude will be the radius of the ferris wheel, so:

A=-8

it's negative because it starts at the lowest point.

the angular speed is the angle the ride will move in a given amount of time. In this case:

\omega=\frac{\pi rad}{1 min}

\omega=\pi rad/min

There will be no phase shift for this problem.

the vertical shift is the height of the platform, so:

C= 2

so the algebraic expression is:

y=-8cos(\pi t)+10

b) In order to find the total time for which she will enjoy the ride we must start by building an inequality:

-8cos(\pi t)+10>12

and solve it for t. We can start by turning it into an equation, solve it for t and find the answers that can be found into its domain, in this case D=[0,4]

so we get:

-8cos(\pi t)+10=12

we subtract a 10 from both sides so we get:

-8cos(\pi t)=2

and divide 8 to both sides so we get:

cos(\pi t)=-\frac{1}{4}

Next, we take the inverse cosine to both sides and get different answers:

\pi t = 1.823+2\pi n

and

\pi t=4.46 + 2\pi n

we take both equations and divide them into pi so we get:

t = 0.58+2 n

and

t=1.42 + 2n

so now we find the possible answers that are between 0 and 4 minutes, this is for n=0 and 1, so we get the following times:

t={0.58, 1.42, 2.58, 3.42} min

we can now build our possible intervals for which the ferris wheel is higher than 12 m so we get the following intervals:

(0, 0.58) (0.58, 1.42) (1.42, 2.58) (2.58, 3.42) and (2.58, 4)

so we pick a test value for each of the intervals and test it on our equation. If the equation gives us a number that is greater than 12, then we have a valid interval. If we get a value that is less than 12, then we just discard that interval.

for (0, 0.58) we use 0.5 and get an answer of 10. We discard this interval.

for (0.58, 1.42) we use 1 and get an answer of 18. This is a valid interval.

for (1.42, 2.58) we use a 2 and get an answer of 2. We discard this interval.

for (2.58, 3.42) we use a 3 and get an answer of 18. This is a valid interval.

and finally, for (2.58, 4) we use a 3.5 and get an answer of 10. We discard this interval

So we have two valid intervals now: (0.58, 1.42) and (1.42, 2.58). So now we can use them to find the time for which Mary will enjoy the scenery.

t_{1}=1.42min-0.58min=0.85min

t_{2}=2.58min-1.42min=0.85min

t_{total}=0.85min+0.85min

t_{total}=1.68min

so:

Mary will be able to enjoy the scenery for a total of 1.68 min or about 101 seconds.

8 0
3 years ago
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