( 1)(33+32+28+32+25+24+3 1+35)/8=30

(2)30* 18 1=5430

2. There are X medium-sized cars, because there are 50 small and medium-sized cars in the parking lot now, so there are 50-X small cars, which can be expressed as 6X+4(50-X)=230.

Solve X= 15

That is, 65,438+05,35 medium and small cars.

3.

(1) Whether in Restaurant A or Restaurant B, P= 1/6*2= 1/3.

(2) It can be considered as the overall probability minus the probability that no one eats in restaurant B..

P= 1- 1/6=5/6