231k views
2 votes
Help asap pleeaasssseeeeee

Help asap pleeaasssseeeeee-example-1
User Ceren
by
8.5k points

2 Answers

2 votes

Answer:

B. 30.47.

Explanation:

E(X) = 23*0.16 + 25*0.09 + 26*0.18 + 31*0.12+ 34*0.24+38*0.21

= 30.47.

User Lewis Diamond
by
7.0k points
1 vote

Answer:

B. 30.47

Explanation:

The mean for a discrete random variable when the probability distribution is given is calculated by the formula:

E(X) = ∑(x_i)*P(x_i)

So, from the values given in the table


E(X) = (23)(0.16) + (25)(0.09)+(26)(0.18)+(31)(0.12)+(34)(0.24)+(38)(0.21)\\= 3.68+2.25+4.68+3.72+8.16+7.98\\= 30.47

Hence, the correct answer is:

B. 30.47 ..

User Corinne
by
7.8k points

No related questions found

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.4m questions

12.2m answers

Categories