Q1) In recent study, following percentages of US retail car sales were reported: 

Small: 28.1%

Midsize: 47.8%

Large: 7%

Luxury:17.1%

Survey of retail sales in particular city points out that of 100 cars sold recently, breakdown was as follows: 

Small: 25

Midsize: 50

Large: 10

Luxury: 15

At alpha = 0.05, is there enough evidence to conclude that proportions vary from those in the study?

Q2) The symbol illustrtaes the:

i) union of events 

ii) intersection of two events 

iii) sum of the probabilities of events 

iv) sample space

Q3) If penny is tossed 3 times and comes up heads all 3 times, probability of heads on fourth trial is:

i) zero 

ii) 1/16 

iii) 1/2 

iv) larger than the probability of tails