1.In a random sample of 40 refrigerators, the mean repair cost was $150. Assume the population standard deviation σ = $15.5.a. Construct a 99% confidence interval for the population mean repair cost. Interpret the interval in the context of the problem. [Use Algebra]b. Repeat exercise 1(a), changing the sample size to n = 60. Which confidence interval has better estimate? Why? Explain? [Use Algebra]c. Repeat exercise 1(a), using a population standard deviation of σ = $19.5. Which confidence interval is wider? Explain? [Use Algebra]

d) by the cross product property, ab^2 = bc multiplied by ad

step-by-step explanation:

we are given

in the given triangle abc

angle a is 90° and segment ad is perpendicular to segment bc

we can see that

triangle(abc) and triangle(abd) are similar because they have common side and same angle (90 degree)

so, triangles(abc) and abd are similar

since, they are similar

so, the ratio of their sides must be equal

we get

now, we can cross multiply

and we get

so, this could be step to prove it

exactly you go it

step-by-step explanation:

3+x

step-by-step explanation: