Quote:
Originally Posted by rimza
The average of x numbers is 15. If two of the numbers are each increased by y, the new average will be increased by how much?
A fair coin is tossed three times. What is the probability that at least one head appears?
A square and an equilateral triangle have the same perimeter. The area of the square is 225 cm . What is the length of a side of the triangle?
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the probability of either tail or head is 1/2 each,
we have to toss a coin three times, lets suppose no head occurs only tail occurs then the probability of tail would be :
1/2*1/2*1/2= 1/8
now only one head occurs then :
1-1/8 = 7/8