Question

analyzing student work for errors
plant growth
growth (cm)
water (ml)
dean describes the data in the histogram as having a cluster from 30–60 and a peak at 40–49. he says the intervals 0–9 and 80–89 show a 0 frequency. lastly, he says that the graph is not symmetrical. why is dean incorrect?
the graph does not show a peak.
there is no cluster in this data set.
the graph does not show intervals with 0 frequency.
the graph is symmetrical.

Explanation:

A peak in a histogram is the interval with the highest frequency. Here, the interval 40 - 49 has the highest bar (frequency). A cluster is a group of adjacent intervals with relatively high frequencies. The intervals 30 - 60 have higher frequencies compared to others. For intervals with 0 frequency, in a histogram, if an interval has 0 frequency, there is no bar for that interval. In the given histogram, the intervals 0 - 9 and 80 - 89 have bars (their height is 1), so they do not have 0 frequency. Symmetry in a histogram means that the left - hand side of the histogram is a mirror image of the right - hand side. Here, the histogram is not symmetrical.

Answer:

The graph does not show intervals with 0 frequency.