number of multiples of 3 or 7 from 1 to 20
p(multiples of 3 or 7)=
Number of even or odd numbers
p(even or odd)=
no. of prime numbers and 1
p(prime or 1)=
probability could be found by general probability which says
The probability density function of the net weight in pounds of a packaged chemical herbicide is
a. Determine the probability that a package weighs more than 50 pounds.
b. How much chemical is contained in 90% of all packages?