Answer:
Equation: w = (1/8) c
c at w = 44 minutes is 352 minutes
Explanation:
We are given that:
1- Time taken to cycle from library to mall is c minutes
2- Time taken to walk from library to mall is w minutes
3- Time taken to walk = 1/8 time taken to cylcle
Therefore:
w = (1/8) c
Now, we want to find c if w = 44 minutes
All we do is substitute with the w in the equation and get c as follows:
w = (1/8) c
44 = (1/8) c
c = 44*8 = 352 minutes
Hope this helps :)
Answer:
a: 258.09
b: 178.88
Step-by-step explanation:
For a: Since n > 30, we use a z-value that corresponds to 0.01, or 99% confidence. This z-value is: 2.575
We have:
x = 265, n = 459, σ = 50. See the calculation for the error and the construction of the confidence interval on the first attached photo
For b: Since n > 30, we use a z-value that corresponds to 0.05, or 95% confidence. This z-value is: 1.96
x = 180, n = 308, σ = 10 (it gives σ² = 100. so σ = 10). See the calculation for the error and the construction of the confidence interval on the second attached photo