# normal probability

• Nov 9th 2008, 11:07 AM
stewardt
normal probability
4. (18 points / 3 points each) Mileages for taxi rides from Penn Station to their destination are approximately normally distributed with a mean of µ = 4.3 miles and a standard deviation of σ = 1.2 miles.

a. Classify this problem by type using the letter choices:
A. binomial probability problem, C. normal probability problem about a single X,
B. uniform probability problem, D. normal probability problem about a
E. none of the above.

b. What is the probability that a taxi ride is greater than 6 miles?

c. What is the probability that a taxi ride is between 1 and 3 miles?

d. What is the expected length of any given taxi ride?

e. Find the taxi ride mileage that would represent the 80th percentile or P80.

e. If the longest 15% of taxi rides receive a discount, determine the mileage for which customers would receive the discount.
• Nov 9th 2008, 11:09 AM
mr fantastic
Quote:

Originally Posted by stewardt
4. (18 points / 3 points each) Mileages for taxi rides from Penn Station to their destination are approximately normally distributed with a mean of µ = 4.3 miles and a standard deviation of σ = 1.2 miles.

a. Classify this problem by type using the letter choices:
A. binomial probability problem, C. normal probability problem about a single X,
B. uniform probability problem, D. normal probability problem about a
E. none of the above.

Mr F says: C!!

b. What is the probability that a taxi ride is greater than 6 miles?

c. What is the probability that a taxi ride is between 1 and 3 miles?

d. What is the expected length of any given taxi ride?

e. Find the taxi ride mileage that would represent the 80th percentile or P80.

e. If the longest 15% of taxi rides receive a discount, determine the mileage for which customers would receive the discount.

These questions are done just like the other normal ones I showed you in your other question. Where are you stuck? What have you tried?
• Nov 9th 2008, 01:40 PM
stewardt
Quote:

Originally Posted by mr fantastic
These questions are done just like the other normal ones I showed you in your other question. Where are you stuck? What have you tried?

a)C
b).0783
c).1363
d)4.3
e)5.31
f)5.5

These are the answers I got
• Nov 9th 2008, 06:38 PM
mr fantastic
Quote:

Originally Posted by stewardt
a)C
b).0783
c).1363
d)4.3
e)5.31
f)5.5

These are the answers I got

They're all correct (within the accuracy you've rounded to).