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zloy xaker [14]
3 years ago
5

In a survey of a community, it was found that 55%

Mathematics
1 answer:
ella [17]3 years ago
7 0

Answer:

The number of people who like winter season is 1000.

Step-by-step explanation:

Event event correspond to a set in the Venn diagram, and we use it to find the percentages.

I am going to say that:

Event A: Like summer season

Event B: Like winter season.

55% like summer season

This means that P(A) = 0.55

20% like winter season

This means that P(B) = 0.2

40% don't like both seasons

This means that 100% - 40% = 60% like at least one, which means that P(A \cup B) = 0.6

Proportion who like both:

This is P(A \cap B). The measures are related by the following equation:

P(A \cup B) = P(A) + P(B) - P(A \cap B)

P(A \cap B) = P(A) + P(B) - P(A \cup B)

Using what we have

P(A \cap B) = 0.55 + 0.2 - 0.6 = 0.15

750 like both seasons.

This is 15% of the sample. So the total number of people is t, for which:

0.15t = 750

t = \frac{750}{0.15}

t = 5000

20% like winter season

Out of 5000. So

0.2*5000 = 1000

The number of people who like winter season is 1000.

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Answer:

The equation of the line that passes through the point (-2,7) and is perpendicular to the line x-6y=42 is

6x+y=-5

Step-by-step explanation:

Given:  

Let,  

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So,

Product of slopes = - 1

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Slope of the required line is -6

Equation of a line passing through a points A( x₁ , y₁) and having slope m is given by the formula,  

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(y-y_{1})=m(x-x_{1})

Now on substituting the slope and point A( x₁ , y₁) ≡ ( -2, 7) and slope = -6 we get

(y-7)=-6(x--2)=-6(x+2)=-6x-12\\\\\therefore 6x+y=-5.......is\ the required\ equation\ of\ the\ line

The equation of the line that passes through the point (-2,7) and is perpendicular to the line x-6y=42 is

6x+y=-5

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