Question: A city's temperature is modeled as a normal random variable with mean and standard deviation both equal to 10 degrees Celsius. What is the probability

A city's temperature is modeled as a normal random variable with mean and standard deviation both equal to 10 degrees Celsius. What is the probability that the temperature at a randomly chosen time will be less than or equal to 15 Celsius? Let Y = 1 if the temperature is less than or equal to 15 Celsius, and Y = 0 otherwise. Find the variance of Y

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