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RoseWind [281]
3 years ago
7

Carla is cutting pieces of string that are exactly inches long. How many pieces can she cut from a ball of string that is 100 fe

et?
Mathematics
1 answer:
siniylev [52]3 years ago
6 0

Answer:

the answer is  Length of each string = 195/8 inch

Total length= 100*12 = 1200 inch

Number of pieces = Total length/ Length of each piece = 1200/ (195/8)= (1200*8)/195

Step-by-step explanation:

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When studying radioactive material, a nuclear engineer found that over 365 days,
Gnom [1K]

Answer:

a) The mean number of radioactive atoms that decay per day is 81.485.

b) 0% probability that on a given day, 50 radioactive atoms decayed.

Step-by-step explanation:

Poisson distribution:

In a Poisson distribution, the probability that X represents the number of successes of a random variable is given by the following formula:

P(X = x) = \frac{e^{-\lambda}*\lambda^{x}}{(x)!}

In which

x is the number of sucesses

e = 2.71828 is the Euler number

\lambda is the mean in the given interval.

a. Find the mean number of radioactive atoms that decayed in a day.

29,742 atoms decayed during 365 days, which means that:

\lambda = \frac{29742}{365} = 81.485

The mean number of radioactive atoms that decay per day is 81.485.

b. Find the probability that on a given day, 50 radioactive atoms decayed.

This is P(X = 50). So

P(X = 50) = \frac{e^{-81.485}*(81.485)^{50}}{(50)!} = 0

0% probability that on a given day, 50 radioactive atoms decayed.

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Can someone please help
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It is B or 2. Hope this helps


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