The Bank of america trends in Consumer Mobility Report indicates that in a typical day,51% of users of mobile phones use their phone at least once per hour, 26% use their phonea few times per day, 8% use their phone morning and evening, and 13% hardly ever usetheir phones. The remaining 2% indicated that they did not know how often they usedtheir mobile phone (USa today, July 7, 2014). Consider a sample of 150 mobile phoneusers.a. what is the probability that at least 70 use their phone at least once per hour?b. what is the probability that at least 75 but less than 80 use their phone at least onceper hour?

Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter11: Data Analysis And Probability
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The Bank of america trends in Consumer Mobility Report indicates that in a typical day,
51% of users of mobile phones use their phone at least once per hour, 26% use their phone
a few times per day, 8% use their phone morning and evening, and 13% hardly ever use
their phones. The remaining 2% indicated that they did not know how often they used
their mobile phone (USa today, July 7, 2014). Consider a sample of 150 mobile phone
users.
a. what is the probability that at least 70 use their phone at least once per hour?
b. what is the probability that at least 75 but less than 80 use their phone at least once
per hour?

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