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It is the frequency.

Q: What is the number of vibrations that occur in a 1-second time interval.?

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That's the (frequency of the vibrations) multiplied by the (number of seconds in the time interval)

It is called the frequency. The SI unit is the Hertz. One Hertz is one cycle per second.

Get a calendar. Start on a Monday and mark off 45 days. Count the number of Mondays you have crossed off. The answer will be 7.

Start with Monday as the first day, and count. This will give the maximum number of Mondays possible. The answer turns out to be 7, with a couple of days of wiggle-room. I just now realized that I mis-read the question. You are not asking for the maximum number, but in fact the smallest: the greatest number that can appear in any 45 day period. So the answer is actually 6, not 7. There can be no fewer than 6 Mondays in any interval of 45 days.

The normal distribution is a continuous probability distribution that describes the distribution of real-valued random variables that are distributed around some mean value.The Poisson distribution is a discrete probability distribution that describes the distribution of the number of events that occur within repeated fixed time intervals, where the mean frequency is a known value, and each interval is independent of the prior interval(s)/event(s).

Related questions

That's the (frequency of the vibrations) multiplied by the (number of seconds in the time interval)

frequency

frequency

It is called the frequency. The SI unit is the Hertz. One Hertz is one cycle per second.

hertz??

frequency

When vibrations from someone or something occur the ear captures the vibrations if it is close enough.

sciesmic waves ;]

Earthquakes

Both divide the data into discrete groups or intervals. The frequency histogram gives the number of times the data occur in the particular group or interval, while the relative frequency histogram gives the fraction of times the data occur in the particular group or interval.

Tics usually occur in "bouts" with many tics over a short interval of time

because of all the vibrations that all the mountains make because of all the vibrations that all the mountains make