Question

Does listening to soothing music help employees concentrate better? A psychologist studied the number of puzzles employees of a large business were able to solve in a five-minute period while listening to soothing music. Let X be the number of puzzles completed successfully by a subject. The psychologist found that X had the following probability distribution.

Value of X   1 2 3 4
Probability 0.2 0.4 0.3 0.1

Reference: Ref 4-4

P(X < 3) has value:

Question 5 options:

	0.3.
	0.4.
	0.6.
	0.9.

Answer 1