Answer:
Step-by-step explanation:
Average life of electric bulbs = 300 hrs
standard deviation = 45
Total no of bulbs tested = 100
Probability that sample mean is less than 295 =?
Using Central Limit Theorem
From table of normal distribution:
A fan consumes 1 unit of electricity in 3 hours. Rahul has 2 fans which consumed 21 units this month. For how many hours did he
2 answers:
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Sum of geometric sequence
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-5 times -3 is 15, -15 times -3=-45 etc
first term is -5
and we want the 8th term
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for the sum where the initial value is a₁ and the common ratio is r and the term is n
common ratio is -3
-5 times -3 is 15, -15 times -3=-45 etc
first term is -5
and we want the 8th term
the sum is 8200