All 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?View SolutionSubmit Solution- 1,403.0K views
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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 very big building in which thousand monkeys are living is lighted by thousand lamps. Every lamp is connected to a unique on/off switch, which are numbered from 1 to 1000. At some moment, all lamps are switched off. But because it is becoming darker, the monkeys would like to switch on the lights. They will do this in the following way.
Monkey 1 presses all switches that are a multiple of 1.
Monkey 2 presses all switches that are a multiple of 2.
Monkey 3 presses all switches that are a multiple of 3.
Monkey 4 presses all switches that are a multiple of 4.
Etc., etc.How many lamps are switched on after monkey 1000 pressed his switches?
And
which lamps are switched on?View SolutionSubmit Solution- 1,406.7K views
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- 1 votes