Question: please show work for part a and b not excel must be written so i can understand the formula thank you 2. The results of

please show work for part a and b not excel must be written so i can understand the formula thank you

2. The results of a survey of 1000 married couples and the number of children they had is shown below. (Keep three decimals for calculation result in this question) a) What is the probability that a randomly selected couple will have at least 2 children? (5 points) Number of Children Probability 0 0.1 1 0.3 2 0.4 3 0.2 b) Calculate the expected value and the standard deviation of the number of children in a family. (10 points)

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