Fill in the blanks:
a. An activity that yields a result or an outcome is called an .
b. An _is a collection of some of the possible outcomes from the sample space.
c. Two events A, B are to be if they cannot both occur together when an experiment is performed.
d. Suppose A, B, are events from some sample space. Complete the formula: P(A or B) =
e. Suppose that A is an event in a finite sample space S and each outcome in S is equally likely, Let n(A) represent the number of distinct outcomes in A and n(S) represent the total number of distinct outcomes in S. Complete the formula: P(A)=
f. Let A be an event. Complete with a number:
P(A) + P(A) =
g. True or False: The probability for an event A is a non-negative number that is no larger than 1.
h. A person purchases a package of 10 ball-point pens which, unknown to the purchaser, contains 4 defective pens. Of the first 2 pens used by the purchaser, find the probability that at least 1 pen is defective.