Question

the dot plot shows the birth year of everyone who works at sams 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
1965 1970 1975 1980 1985 1990
the spread is from 1966 to 1987.
there are 5 gaps.
the peak is at 1985.
the center is at 1977.

Explanation:

Examine the dot - plot. The peak is the year with the most number of dots. Counting the dots for each year, we see that 1985 has the most dots, so the peak should be at 1985, not 1984 as Sam said.

Answer:

The peak is at 1985.