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It is known that people in the USA spend on average 15 hours a day using electronic devices with a standard deviation of 4.75 hours.
It is known that people in the USA spend on average 15 hours a day using electronic devices with a standard deviation of 4.75 hours. This data follows a normal distribution. What is the probability someone spends more than 13 hours using electronic devices a day if it is known that they spend less than 20 hours using electronic devices a day? (round your answer to 4 decimals) (Hint: Normal distribution and conditional probability)
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0.6043
0.7580
0.2420
0.4525
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