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Gnom [1K]
3 years ago
12

A survey is made in a neighborhood of 80 voters. 65 are democrats and 15 are republicans. of the democrats, 35 are women, while

5 of the republicans are women. if one subject from the group is randomly selected, find the probability the individual is a democrat or a republican.
Mathematics
2 answers:
balandron [24]3 years ago
8 0

<u>Answer</u>:  1

<u>Step-by-step explanation</u>:

Given: Total voters n(S)= 80

Number of democrats n(D)= 65

Number of republicans n(R)= 15

Number of voters that are democrats and republicans=n(D\cap R)=0

[Since both are different parties and thus independent means no individual can be common in both parties]

Then, the number of individuals that are  democrat or republican is given by :-

n(D\cup R)=n(D)+n(R)-n(D\cap R)\\\\\Rightarrow n(D\cup R)=65+15-0\\\\\Rightarrow n(D\cup R)=80

If one subject from the group is randomly selected, find the probability the individual is a democrat or a republican=P(D\cup R)=\frac{n(D\cup R)}{n(S)}=\frac{80}{80}=1

Aleksandr [31]3 years ago
7 0
Total voters=v=80
total no. of democrats=d=65
total no. of republicans=r=15
probability of democrats=p1=65/80=0.8125
probability of republicans=p2=15/80=0.1875
probability of a democrat or a republican=p1+p2=0.8125+0.1875=1 <span />
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A boat leaves the harbor entrance and travels 28 miles in the direction N 43° E. The captain then turns the boat 90° and travels
Serga [27]

Answer:

Step-by-step explanation:

A boat leaves the harbor entrance and travels 28 miles in the direction N 43° E.

Displacement in vector form

= 28 cos43 i + 28sin43j

= 20.47 i + 19.1 j

The captain then turns the boat 90° and travels another 15 miles in the direction S 47° E

Displacement

= 15 cos47 i - 15 sin47 j

= 10.22 i - 10.97 j

Total displacement

= 20.47 i + 19.1 j + 10.22 i - 10.97 j

= 30.69 i - 8.13 j

Magnitude of displacement

= 31.75 miles

Angle with east direction

TanФ = - 8.13 / 30.69

Ф = 15 degree  south of east.

3 0
2 years ago
What is 0.02% of 40 million pounds?
DanielleElmas [232]
0.02% of 40 million pounds is 8000 (pounds)

5 0
2 years ago
A bowl is in the shape of a hemisphere (half a sphere) with a diameter of 8 inches. Find the volume of the bowl. Use 3.14 for pi
gayaneshka [121]

Answer: 267.947 (or 267.95) inches^3

Step-by-step explanation:

The formula for the volume of a sphere is \frac{4}{3}\pi r^{3}.

To find your radius (r), divide the diameter of 8 inches by 2. <em>The radius is 4 inches.</em>

Plug in your numbers to the volume equation to get \frac{4}{3} (3.14)(4^3). The first step is to cube 4 (4*4*4) to get <em>64</em>. Now your equation is \frac{4}{3}(3.14)(64).

Multiply 3.14 and 64 to get <em>200.96</em>. The equation is now \frac{4}{3}(200.96) or \frac{4}{3} * \frac{200.96}{1}.

Multiply the numerators (4 * 200.96) and denominators (1 * 3) to get a final equation of \frac{803.84}{3}.

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8 0
2 years ago
Question: (Graph photo attached)
Anna11 [10]

The double bar graph shows the number of imports and exports for a company in a certain week.

On how many days was the number of exports greater than the number of imports?

Answer: From the given double bar graph, we clearly see:

Number of imports for a company on Monday = 15

Number of exports for a company on Monday = 7

Number of imports for a company on Tuesday = 18

Number of exports for a company on Tuesday = 9

Number of imports for a company on Wednesday = 14

Number of exports for a company on Wednesday = 14

Number of imports for a company on Thursday = 15

Number of exports for a company on Thursday = 6

Number of imports for a company on Friday = 9

Number of exports for a company on Friday = 19

From the above information, we clearly see that only on Friday the number of exports are greater than number of imports. Therefore, there is only 1 day when the number of exports greater than the number of imports.

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8 0
3 years ago
A container has 360 gallons ; daniel took 1/3 of water to give to the animals in the ranch; how many gallons of water are left?
Mrrafil [7]

Answer: 240 gallons

Step-by-step explanation:

From the question, we are informed that the container has 360 gallons and that Daniel took 1/3 of water to give to the animals in the ranch. Therefore, the amount of water that Daniel took will be:

= 1/3 × 360

= 120 gallons

Since we have 360 gallons at the beginning and Daniel has taken 120 gallons, the amount of gallons that'll be left will be:

= 360 - 120

= 240 gallons

8 0
3 years ago
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