a 30 b 20 c 10 d 40 The number of cars waiting at a certain

a) 30.
b) 20.
c) 10.
d) 40.

The number of cars waiting at a certain residential neighborhood stop light is observed at 6:00 a.m. on 160 different days. The observed sample frequencies are shown here: Under the null hypothesis of a uniform distribution, the expected number of days we would see 0 cars is: a) 30. b) 20. c) 10. d) 40.

Solution

I think d) 40.