In the following probability distribution, the random variable X represents the

Question

In the following probability distribution, the random variable X represents the number of activities the mother of a K-5th grade students is involved in :

-------------------

x     P(X=x)

-------------------

0        .044

1        .084

2        .209

3        .325

4        .338

-----------------------

----------------------

a. compute the probability that a randomly selected mother is involved in three activities?

b. Compute the probability that a randomly selectd mother is involved in more than two activities?

c. Compute the mean of X.

Explanation / Answer

a.The probability that a randomly selected mother is involved in three activities is P(X=3)=0.325

b.The probability that a randomly selectd mother is involved in more than two activities is:

P(X=3)+P(X=4)

=0.325+0.338=0.663

c.The mean of X is:

0*0.044+1*0.084+...+4*0.338

=2.829

Related Questions

Navigate

• Browse (All)
• Browse I
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.