There are 10 members of the Board of Directors of the Mean Corporation. Their annual incomes are presented in the following table. Director 1 2 3 4 5 6 7 8 9 10 Income (thousands $) 133 141 124 136 141 140 130 122 129 128 a)Calculate the mean income for the members of the Board of Directors. Give your answer in dollars to the nearest thousand dollars. Mean = $ b)Calculate the standard deviation of income for the members on the Board of Directors. Give your answer in dollars to the nearest dollar. Standard deviation = $