Arandom sample of 50 cars in the drive-thru of a popular fast food restaurant revealed an average bill of $18.21 per car. the population standard deviation is $5.92. round your answers to two decimal places.

(a) state the point estimate for the population mean cost of fast food bills at this restaurant $

(b) calculate the 95% margin of error. $

(c) state the 95% confidence interval for the population mean cost of fast food bills at this restaurant. $ ≤ µ ≤ $

(d) what sample size is needed if the error must not exceed $1.00? n =

a)

b) 1.64

c) (16.57,19.85)

d) The sample size must be 135 or greater if the error must not exceed $1.00.

Step-by-step explanation:

We are given the following information in the question:

Sample size, n = 50

Sample mean =   $18.21

population standard deviation = $5.92

a)  Point estimate for the population mean cost

b) Margin of error =

Margin of error =  

c) 95% Confidence interval

Putting the values, we get,

d) Marginal error less than $1.00

Thus, the sample size must be 135 or greater if the error must not exceed $1.00.

i think the answer is seven, for if i'm being useless °ω°

step-by-step explanation:

b

step-by-step explanation:

the equation of a line in point- slope form is

y - b = m(x - a)

where m is the slope and (a, b) a point on the line

calculate m using the slope formula

m = (y₂ - y₁ ) / (x₂ - x₁ )

with (x₁, y₁ ) = (0, 4) and (x₂, y₂ ) = (3, - 5) ← 2 points on the line

m = = = - 3

with m = - 3 and (a, b) = (3, - 5), then

y - (- 5) = - 3(x - 3), that is

y + 5 = - 3(x - 3) → b