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Tomorrow's noon temperature (C) in City A is modeled by a random variable X1 with an expected value of 15 and a standard deviation of

Tomorrow's noon temperature (C) in City A is modeled by a random variable X1 with an expected value of 15 and a standard deviation of 2.1 degrees. The corresponding temperature in City B is modeled with a random variable X2 with an expected value of 15 and a standard deviation of 1.6 degrees. The correlation of the random variables X1 and X2 is estimated to be 0.3.

Calculate the standard deviation for M:

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