Time is ratio data because it has a true, meaningful data. You can say that at time 20 seconds, it is twice the amount of time than 10 seconds.
Interval data doesn't have a true zero e.g. degrees celcius. Although you can say 60 degrees is hotter than 30 degrees you can't say that it is twice as hot.
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It is a HISTOGRAM.
No.
A variable measured at the interval or ratio level can have more than one arithmetic mean.
He discovered the ratio of a perfect octave is 2:1.
He discovered the ratio interval of a perfect octave is 2:1.