The following table shows the life expectancy for an individual born in the United States in certain years. Year of Birth Life Expectancy 1930 59.7 1940 62.9 1950 70.2 1965 69.7 1973 71.4 1982 74.5 1987 75 1992 75.7 2010 78.7 Calculate the least squares line. Put the equation in the form of: y = a + bx. Enter the value for b below. Round to one decimal place