The dot plot shows the birth year of everyone who works at sam’s office. the youngest person who works there was born in 1987. sam described the data as having a spread from 1965 to 1987, four gaps, a peak at 1984, and a center of 1978. where did sam make an error?

birth year of employees

a dot plot going from 1965 to 1990. 1966 has 7 dots, 1969 has 2 dots, 1974 has 3 dots, 1975 has 1 dot, 1976 has 3 dots, 1977 has 2 dots, 1977 has 2 dots, 1978 has 5 dots, 1981 has 3 dots, 1983 has 1 dot, 1984 has 8 dots, 1985 has 3 dots, 1986 has 1 dot, 1987 has 1 dot. all other years have 0 dots.
the spread is from 1966 to 1987.
there are 5 gaps.
the peak is at 1985.
the center is at 1977.