We have been given for a normal distribution the mean time it takes to walk to the bus stop is 8 minutes with a standard deviation of 2 minutes. And the mean time it takes for the bus to get to school is 20 minutes with a standard deviation of 4 minutes.
(a) Average time that it would take reach school can be obtained by adding the average times.
8+20 = 28 minutes.
(b) Standard deviation of the trip to school can be found as:

Therefore, standard deviation of the entire trip is 4.47 minutes.
(c) Let us first find z score corresponding to 30 minutes.
We need to find the probability such that 
Therefore, the required probability is 0.67.
(d) If average time to walk to school is 10 minutes, then overall average time for the trip will be 10+20 = 30 minutes.
(e) Standard deviation won't change it will remain 4.47
(f) The new probability will be:


Therefore, probability will be 0.50.
Thank you for posting your question here at brainly. I hope the answer will help you. Feel free to ask more questions.
depth of water is proportional to time
d = k*t
<span>d = 7/2 * t </span>
<span>a) the point (2,28) represents the rate 28/8 </span>
b) 3.5 cm/sec
<span>c) the slope between (8, 28) and (6, 21) is 7/2 = 3.5</span>
Step 1: to solve this equation first subtract 4.9 from both sides.
w + 4.9 - 4.9 = 6.88 - 4.9
When you reduce that your answer should be w = 1.92
Therefore the weight of ingredients other than granola in Miranda's trail mix is 1.92
Answer:
i think you mean area so 31?
Step-by-step explanation:
i need more stuff to answer that
Answer:
50 over 1 (4n - 1) = 5050
I hope I helped you^_^