Brain Teasers & Puzzles
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The lifetime of a color TV picture tube is normally distributed, with a mean of 8 years and a std. dev. of 2 years.
(i) What is the probability that a picture tube will last more than 10 years?
(ii) If the firm guarantees the picture tube for 4 years, what percentage of the tubes sold will have to be replaced?
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Two women set out to the market to sell some oranges. Each had 30 oranges.
The first lady sold oranges at 2 for a rupee and second lady sold oranges at 3 for rupee. At last, the first and second lady made Rs 15 and Rs 10 respectively.
So the total amount is Rs 25.The next day,
when they sold their 30 oranges together to make business profitable, they pooled their sixty oranges and sold at rate of 5 for Rs 2. After they sold all oranges, they found they had only Rs 24.They could not understand where the one rupee went. Where did it go?
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A man says,”Brothers and sisters, have I none, but that man’s father is my father’s son.” Who is that man??
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