The amount of car accidents caused by faulty brakes, like accidents caused by faulty wiring, has increased significantly since regulations on manufacturing have been relaxed. A)The amount of car accidents caused by faulty brakes, like accidents caused by faulty wiring, has increased significantly si...

Thank you supratims for your explanation. I'm also curious to know, would it have been correct If the sentence provided were also there in the options. MGMAT staf, please provide your insight. Thanks

Hello Stacey,

Is the following method of solving this problem correct ?

The probability that John will be selected is: 5/9

The probability that Peter will be selected is: 4/8

So the probability that John and Peter both will be selected is: 5/9*4/8 = 5/18 ?

Please comment. Thanks

If Q is a set of consecutive integers, what is the standard deviation of Q? (1) Set Q contains 21 terms. (2) The median of set Q is 20. The procedure for finding the standard deviation for a set is as follows: 1) Find the difference between each term in the set and the mean of the set. 2) Average th...

I have updated the original post with complete answer explanation from MGMAT. The answer given is A. I didn't understand without knowing how consecutive numbers are evely placed we can determine standard deviation.