Pls help me with this hypothesis testing homework
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Using a discrete probability distribution, it is found that:
a) There is a 0.3 = 30% probability that he will mow exactly 2 lawns on a randomly selected day.
b) There is a 0.8 = 80% probability that he will mow at least 1 lawn on a randomly selected day.
c) The expected value is of 1.3 lawns mowed on a randomly selected day.
<h3>What is the discrete probability distribution?</h3>Researching the problem on the internet, it is found that the distribution for the number of lawns mowed on a randomly selected dayis given by:
- P(X = 0) = 0.2.
- P(X = 1) = 0.4.
- P(X = 2) = 0.3.
- P(X = 3) = 0.1.
Item a:
P(X = 2) = 0.3, hence, there is a 0.3 = 30% probability that he will mow exactly 2 lawns on a randomly selected day.
Item b:
There is a 0.8 = 80% probability that he will mow at least 1 lawn on a randomly selected day.
Item c:
The expected value of a discrete distribution is given by the <u>sum of each value multiplied by it's respective probability</u>, hence:
E(X) = 0(0.2) + 1(0.4) + 2(0.3) + 3(0.1) = 1.3.
The expected value is of 1.3 lawns mowed on a randomly selected day.
More can be learned about discrete probability distributions at brainly.com/question/24855677
The equation of the ellipse in standard form is:
Step-by-step explanation:
The standard form of the equation of an ellipse with center (h , k)
and major axis parallel to x-axis is
1. The length of the major axis is 2a
2. The coordinates of the vertices are (h ± a , k )
3. The coordinates of the foci are (h ± c , k), where c² = a² - b²
∵ The center of the ellipse is (-9 , 3)
∴ h = -9 , k = 3
∵ One focus is (-13 , 3)
∴ Major axis parallel to x-axis
∵ The length of the major axis = 2a
∵ The length of the major axis = 18
∴ 2a = 18
- Divide both sides by 2
∴ a = 9
∵ The coordinates of the foci are (h ± c , k)
∵ One focus is (-13 , 3)
∴ h ± c = -13
∵ h = -9
∴ -9 - c = -13
- Add 9 to both sides
∴ -c = -4
- Divide both sides by -1
∴ c = 4
∵ c² = a² - b²
∵ c = 4 and a = 9
∴ (4)² = (9)² - b²
∴ 16 = 81 - b²
- Subtract 81 from both sides
∴ -65 = -b²
- Divide both sides by -1
∴ b² = 65
- Substitute the values of a² and b² in the equation of the ellipse
∵ a² = (9)² = 81
∵ b² = 65
∵ h = -9 and k = 3
∵
- Substitute the values in the equation
∴
The equation of the ellipse in standard form is:
Learn more:
You can learn more about equations of conics equations in brainly.com/question/3333996
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