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"We know only where she was at intervals of one minute from the table; we can get a rough idea that she was going 5000 ft/min

From

Isnt it should be during the 6th minute?

And in the bold , does it talk about the average speed which is firstly 4900 during 6th minute and then 5100 at the end of 6th minute.

**during**the 7th minute, but**we do not know, at exactly the moment 7 minutes, whether she had been speeding up and the speed was 4900 ft/min at the beginning of the 6th minute, and is now 5100 ft/min,**or something else, because we do not have the exact details in between. So only if the table were completed with an infinite number of entries could we really calculate the velocity from such a table."From

**feynmans lectures on physics. Vol 1.**Isnt it should be during the 6th minute?

And in the bold , does it talk about the average speed which is firstly 4900 during 6th minute and then 5100 at the end of 6th minute.