Answer:
Step-by-step explanation:
Given that in order to efficiently bid on a contract, a contractor wants to be 95% confident that his error is less than two hours in estimating the average time it takes to install tile flooring.
Std deviation =4.5 errors
95% confidence interval = Mean±1.96*std dev
Hence we have
Sample size should be 20.
you can split the figure in multiple parts to make it easier:
area rect. 1;
9m×4m= 36m²
area rect 2:
7m×3m= 21m²
area tri.:
18m× (4m+7m+4m-5m)
=18m× 10m
=180m²
total area:
36m²+21m²+180m²= 237m²
Answer:
-1,0
Step-by-step explanation:
its an estamant so its nothing exactly
its closest to -1 and closest to 0
Answer:
14, 16
Step-by-step explanation:
The prime factorization of 224 is 2⁵ × 7. To make it a perfect square, we need the bases to have an even exponent, therefore we divide it by 2 × 7 = 14 to get 16.