Averaging current draw

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this stupid question, i'm having problem math :d
i'm trying estimate battery life sensor board.
it draws 0.155ma during sleep mode 288 seconds, , 19ma 20 seconds when it's awake.
how calculate average?

quote from: greensprings on jan 20, 2015, 02:59 am
=((.155*288)+(19*20))/(288+20)
=1.52 ma/sec think, assuming
thank thank thank you!!! :)
btw it's 1.38ma/sec


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