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]

maya’s expression will generate the wrong sum because she violated the commutative property.

step-by-step explanation:

18 units²

step-by-step explanation:

first let's find altitude bd using the distance formula

d = √((y₂ - y₁)² + (x₂ - x₁)²)

bd = √((0 - -3)² + (0 - 3)²)

bd = √18

given the placement of points a and c, we can denote that point d bisects segment ac.

we will call ac the base.

using the distance formula

ac = √((0 - 6)² + (-6 - 0)²)

ac = √72

knowing our base and our height, we can plug these into our triangle area formula

area = (b * h)/2

area = (√18 * √72) / 2

area = (√1296) / 2

area = 36 / 2

area = 18 units²

shorter then the tree

i believe so, according to my "strange" way of figuring out weird math problems like this.