question: In a certain animal population, for each of the first 3 months of life, the probability that an animal will die during that month is 1/10. For a group of 500 newborn members of the population, approximately how many would be expected to survive the first 3 months of life?
Options:
(A) 340
(B) 346
(C) 352
(D) 365
(E) 370
answer: Stream of consciousness: Number of newborns that can die in first month = 1/10 * 500 = 50
Survived = 450
Number of newborns that can die in second month = 1/10 * 450 = 45
Survived = 405
Number of newborns that can die in third month = 1/10 * 405 = 40
Survived = 365 The answer is (D).

q: Which one of the following is a prime number?
Options:
(A) 55
(B) 2
(C) 74
(D) 25
(E) 21
a: Stream of consciousness: 2 is divisible by 1 and itself So, it is a prime number. The answer is (B).

question: If the given two numbers are respectively 5% and 25% of a third number, then what percentage is the first of the second ?
Options:
(A) 20%
(B) 25%
(C) 18%
(D) 30%
(E) none of these
answer: Stream of consciousness: Here, l = 5 and m = 25
Therefore, first number = l/m x 100% of second number = 5/25 x 100% of second number = 20% of second number The answer is (A).

q: In what time will a railway train 20 m long moving at the rate of 36 kmph pass a telegraph post on its way?
Options:
(A) 5 sec
(B) 4 sec
(C) 3 sec
(D) 6 sec
(E) 2 sec
a: Stream of consciousness: T = 20/36 * 18/5 = 2 sec The answer is (E).

question: What is the Mode of the following data set R- {1,2,7,9,6,6,7,7}
Options:
(A) 1
(B) 2
(C) 7
(D) 6
(E) 9
answer: Stream of consciousness: Mode of a set is the data point that is repeated the most number of times. In the set given, 7 is repeated. The answer is (C).

question: In how many different number of ways 6 men and 2 women can sit on a shopa which can accommodate persons?
Options:
(A) 1680
(B) 1800
(C) 2000
(D) 2100
(E) 2300
answer:
Stream of consciousness: 8p4 = 8 7 6 x 5 = 1680 The answer is (A).