The average time between incoming calls at a
switchboard is 4.5 minutes. The probability of
waiting less than t minutes for next incoming
call is approximated by the model
F(t) = 1 −e^-t/4.5
If a call has just come in, ﬁnd the probability
that the next call will come within a) .51minutes
So do I just plug in .51 minutes in to t? If I do so I get a decimal and it doesn't seem right. Please help explain this.

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thats what it says, thats what i would do

i guess you have to change 51 minutes to a decimal first

oh no you don't, it says .51 minutes, so just plug it in

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