Question

3. Provide an appropriate response. Round to the nearest hundredth. (1 point) In a certain town, 40% of adults have a college degree. If four adults from the town are selected at random, the probabilities that 0, 1, 2, 3, or 4 of them will have college degrees are provided in the accompanying table. Find the standard deviation for the probability distribution. x 0 1 2 3 4 P(x) 0.1296 0.3456 0.3456 0.1536 0.0256 Oo=0.96 Oo=1.12 Oo=0.98 Oo=1.88 4. Assume that a researcher randomly selects 14 newborn babies and counts the number of (1 point) girls, x. The probabilities corresponding to the 14 possible values of x are summarized in the given table. Answer the questions using the table. Probabilities of Girls x(girls) P(x) x(girls) P(x) x(girls) P(x) 00+ 5 0.122 10 0.061 0.001 6 0.183 11 0.022 0.006 0.209 12 0.006 0.022 8 0.183 13 0.001 0.061 9 0.122 140+ Find the probability of selecting 5 or fewer girls. O 0.001 O 0.122 O 0.923 O 0.212

Answer 1

• 

4)

p(selecting 5 or fewer girl)

=p(X<=5)

=

X	p(X)
0	0
1	0.001
2	0.006
3	0.022
4	0.061
5	0.122

=0.212

5) Answer is 5 because p(x=5)=0.08