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Nutka1998 [239]
3 years ago
9

Peter says he is texting 90% of the time he uses his phone. Peter says he uses his phone 60 minutes a day. How many minutes does

he spend texting each day?
Mathematics
2 answers:
sasho [114]3 years ago
8 0
So what this is asking is how many minutes does he spend texting each day. Well since he only spends 60 minutes texting each day, and 90% of the 60 minutes spent is texting, so how many minutes does he spend texting? So what your trying to find is 90% of 60 minutes. So the problem is 90%, which is the same as .90,times 60. What is .90 times 60? Do that problem and you will get the amount of minutes he spends texting each day.
vitfil [10]3 years ago
6 0
54 mins

I don't have time to explain but that's the answer
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P(k=0)=\binom{1200}{0}p^0(1-p)^{12}=1*1*0.99^{1200}=1* 0.000006 = 0.000006 \\\\ P(k=1)=\binom{1200}{1}p^1(1-p)^{1199}=1200*0.01*0.99^{1199}=1200*0.01* 0.000006 \\\\P(k=1)= 0.00007\\\\\\P(k\leq1)=0.000006+0.000070=0.000076\\\\\\P(k>1)=1-P(k\leq 1)=1-0.000076=0.999924

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P(k=0)=\binom{100}{0}p^0(1-p)^{100}=0.99^{100}=0.366

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