The immigration to the United States from Europe, as a percent of the total immigration, is approximated by the equation below where t is measured in decades, with t = 0 corresponding to the decade of the 1950s. P(t) = 0.767t3 − 0.636t2 − 20.13t + 50.2      (0 ≤ t ≤ 4) (a) Complete the table. (Round your answers to one decimal place.) Use the result of part (a) to sketch the graph of P Use the result of part (b) to estimate the decade when the immigration, as a percentage of the total immigration, was the greatest and the smallest. It was the greatest in the 1970s and the smallest in the 1950s. It was the greatest in the 1950s and the smallest in the 1980s.      It was the greatest in the 1960s and the smallest in the 1970s.It was the greatest in the 1980s and the smallest in the 1950s.

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