document.write( "Question 815715: According to a survey, college students make an average of 11 calls per day on their mobile phone. Moreover, 80% of the students surveyed indicated that their parents pay for their mobile phone expenses.If a student is selected at random, what is the probability that he or she makes:
\n" ); document.write( "(i) More than 12 calls in a day?
\n" ); document.write( "(ii) Less than the average number of calls in a day?
\n" ); document.write( "(iii) More than 15 calls in a day?\r
\n" ); document.write( "\n" ); document.write( "(i) P(x≥12)= 1 - P(0) - P(1)....P(12)
\n" ); document.write( " = 1- e^(-12).12^0/0! until 12??\r
\n" ); document.write( "\n" ); document.write( "its confuse me cause there will be long equation then if that supposed to be? Im very grateful if you can help me with this queation.thank you. \n" ); document.write( "

Algebra.Com's Answer #491203 by ewatrrr(24785) $\"\"$ $\"About$

You can put this solution on YOUR website!

 
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document.write( "Hi,
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document.write( "According to a survey, 
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document.write( "college students make an average of 11 calls per day on their mobile phone.
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document.write( "(i) P ( x > 12)= 0.31130334853593
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document.write( "(ii) P(x < 11) = 0.459888702693687
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document.write( "(iii) P( x > 15)= 0.092603908284245
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document.write( "Poisson Probability Distribution
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document.write( "P(x; A) = 
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document.write( "| A the average number of successes given 
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document.write( "http://stattrek.com/online-calculator/poisson.aspx \n" );
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