Plz help me plz plz plz plz plz plz plz

Mathematics

1 answer:

Andreas93 [3]4 years ago

7 0

Answer

Step-by-step explanation:

well if you find a common denominator it would be 20 because 4 and 5 both go into 20 so

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Delvig [45]

Answer:

14C3 = 364

Step-by-step explanation:

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In a week, 20 hens laid 60 eggs. What is the unit rate for eggs per hen?

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How much money has to be invested at 2.3% interest compounded continuously to have $41,000 after 17 years

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We have to calculate how much money has to be invested at 2.3% interest compounded continuously to achieve $41,000 after 17 years. The formula is: A = P * ( 1 + r )^t, where A = $41,000, r = 0.023 and t = 17. 41,000 = P * ( 1 + 0.023 ) ^17; 41,000 = P * ( 1.023 )^17; 41,000 = P * 1.4719; P = 41,000 : 1.4719; P = 27,855.15. Answer: It has to be invested <span>$27,855. </span>

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4 years ago

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The life, in years, of a certain type of electrical switch has an exponential distribution with an average life β=44. If 100 o

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Answer:

0.9999

Step-by-step explanation:

Let X be the random variable that measures the time that a switch will survive.

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$\bf P(X$

So, the probability that a switch fails in the first year is

$\bf P(X$

Now we have 100 of these switches installed in different systems, and let Y be the random variable that measures the the probability that exactly k switches will fail in the first year.

Y can be modeled with a binomial distribution where the probability of “success” (failure of a switch) equals 0.0225 and

$\bf P(Y=k)=\binom{100}{k}(0.02247)^k(1-0.02247)^{100-k}$