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rbrummitt8029
26.06.2019 •
Mathematics
The length of a text messaging conversation is normally distributed with a mean of 10 minutes and a standard deviation of 4 minutes. what is the probability that a conversation lasts longer than 20 minutes?
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Ответ:
The standard of deviation is 4.
The mean is 10
20 minutes - 10 ( the mean) = 10 minutes longer than the mean.
10 minutes longer / 4 minutes ( deviation) = 2.5 standard deviations.
2.5 on the Z-table = 0.9938
The probability of being more than 20 minutes = 1 - 0.9938 = 0.0062 (0.62%)
Ответ:
i think you need to include a picture
Step-by-step explanation: