Answer:
(27.954, 30.046)
Yes
Step-by-step explanation:
Given that :
Mean (m) = 29
Standard deviation (σ) = 2.2
Sample size (n) = 17
Confidence interval (α) = 95%
Average age as claimed by the company = 28
Confidence interval formula :
Mean ± (Zcritical * σ/sqrt(n))
Zcritical at 95% = 1.96
(Zcritical * σ/sqrt(n)) = (1.96 * (2.2/sqrt(17)) = (1.96 * 0.5335783) = 1.0458136
Lower boundary = (29 - 1.0458136) = 27.954186
Upper boundary = (29 + 1.0458136) = 30.045813
(27.954, 30.046)
b. Does this result lend support to the car's company's claim?
Yes, it does, 28 falls in between the the calculated confidence interval.
So 60% of the class are boys, but we're given the number of girl students. We know that the remaining 40% of the class are girls, which equals 12 students. To find out the total number of students in the class we can divide the number we're given into 10%, which we can then multiply to give 100%.
So 40% of the class equals 12 students, we divide by 4 to give 10%, so 12 ÷ 4 = 3. So 10% of the total class is 3 students, we times by 10 to find 100% of the class, so 3 x 10 = 30 students.
The domain and range of the function f of x are equal to : (C) D: {x ∊ ℝ | x ≠ −2}; R: {y ∊ ℝ | y ≠ 1}
<h3>Meaning domain</h3>
A Domain can be defined as the values or numbers that are accepted or allowed in a particular function.
A domain is very important when dealing with a function.
In conclusion, The domain and range of the function f of x are equal to (C) D: {x ∊ ℝ | x ≠ −2}; R: {y ∊ ℝ | y ≠ 1}
Learn more about Domain: brainly.com/question/26098895
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How many miles of gas does my car travel if it used 2 gallons of gas with a speed of 4 mi/h?
I think the answer would be 1:2 because 15 is half of 30 so the simplest form is a half