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If there are 12 moths and some have 31 days and others have 30 days how many have 28 days?

The random variable x is the number of occurrences of an event over an interval of ten minutes. it can be assumed that the probability of an occurrence is the same in any two-time periods of an equal length. it is known that the mean number of occurrences in ten minutes is 5.3. the appropriate probability distribution for the random variable

Find the midpoint m of z1=(8+5i) and z2=(12+3i)