A recent study revealed that 43% of all U.S. adults are stockholders. In additio

Question

A recent study revealed that 43% of all U.S. adults are stockholders. In addition, the study determined that 75% of all US adult stockholders have a college education. Finally, 40% of all U.S. adults have a college education.   

Own Stock (S)

Not Own Stock (NS)

Total

College (C)

.3225

.0775

.40

Not College (NC)

.1075

.4925

.6

Total

.43

.57

1

What is the joint probability for an adult who does not own stock and does not have a college education?

Own Stock (S)

Not Own Stock (NS)

Total

College (C)

.3225

.0775

.40

Not College (NC)

.1075

.4925

.6

Total

.43

.57

1

Explanation / Answer

p(probability for an adult who does not own stock and does not have a college education) = 0.4925/0.6

=0.820833333

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