There are 10 electric cars in a box and 3 are defective. Two electric cars are...

There are 10 electric cars in a box and 3 are defective. Two electric cars are selected without replacement. What is the chance of selecting two good electric cars?

Use a tree diagram & remember the dependent & independent concept.

A) .47

B) .44

C) .49

D) .09

Solutions

Expert Solution

Prob of selecting two good electric cars =P(G1)*P(G2)

G1 1st select good cars P(G1) =7/10

G2 selecting 2nd good cars when also 1st one is good car without replacement =P(G2) =6/9

P(G1) *P(G2) =7/10*6/9=7/15=0.47

Hence option (A) is correct 0.47

Selecting a car is independent of oyher cars

Solution file is attached go through it

Thanks

orchestra answered 1 year ago

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