Help please..........
2 answers:
You might be interested in
Answer:
Step-by-step explanation:
Leaving leap years, a year contains 365 days.
For a group of 100 people, each person is independent of the other and probability of any day being his birthday has a chance of
a) Probability that exactly 3 people have same birthday =
Each day is independent of the other
And hence no of days having exactly 3 persons birthday out of 100 persons is binomial with n = 365 and p =
Expected value of days = np =
b) Distinct birthdays is binomail with p =1/365 and n = 365
Hence
expected value = np =1
Answer:
Plane speed is 60 miles/hour
Wind speed is 20 miles/hour
Step-by-step explanation:
Lets suppose the speed of the plane in still air is s and speed of the wind is w and since speed in the formula below equals speed of the plane plus the wind's speed so speed=s+w for this journey with the wind
For the first journey the trip with the wind:
Here we got our first equation for the second equation we use the information from the second trip which was into the wind. Which means the speed here would be speed=s-w
so now we got our two equations adding both equations would result into the following:
so speed of the plane is 60 miles/hour put the value of s in any our two equations to calculate the wind speed, lets take the first equation:
so the wind speed is 20 miles/hour
Answer:
I hope it help..........
