Answer
a)0.041
b)0.046
c)The result from b)
d)Yes.
Work Step by Step
a) From the table, the probability of getting exactly 3 failing cars is is: $P(X=3)=0.041.$
b)From the table, the probability of getting at least 3 failing cars is: $P(X\geq3)=P(X=3)+P(X=4)+P(X=5)+P(X=6)=0.041+0.005+0+0=0.046.$
c)The result from b) because it gives us the probability for the range of 3 to 6 whilst a) only gives us the probability of 3.
d) 3 is an unusually high number of girls, because 0.046<0.05.
