The area of the triangle is
A = (1/2)bh
= (1/2)(3 ft)(6 ft)
= 9 ft^2
That triangular area is not carpeted, so the carpet area is
72 ft^2 -9 ft^2 = 63 ft^2.
In this question we simple wish to calculate the standard error and margin of error from the population. This can be done purely using the standard deviation and sample size.
Standard error
= std dev / (SQRT) n
= 11.5 / SQRT of 70
= 11.5 / 8.366
= 1.374
Margin of error is the standard error multiplied by a Z value that correspondence to a confidence percentage. At a 95% confidence the Z value is 1.96. Therefore
MOE = 1.96 x 1.374 = 2.69
Answer:
Electric TV, Airplane, Refrigerator, Computer, Steel
Step-by-step explanation: