ANSWER
0.11
Step-by-step explanation
There are 95 (that is 55 + 40) choices in total and 55 favourable choices.
Now,
The probability of the 1st person being a male is 55/95
The probability of the 2nd person being a male is 54/94
The probability of the 3rd person being a male is 53/93
The probability of the 4th person being a male is 52/92
Hence, the probability of all 4 being males = (55/95)x(54/94)x(53/93)x(52/92) = 0.107
Hence, the probability that all 4 people hired are male is 0.11