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Grade 7 statistics and probability: what it is and what to check

Statistics and Probability is 12 to 21% of the NYS grade 7 math test. Grade 7 adds box plots, comparing two groups of data, and the probability of compound events, on top of the grade 6 statistics that are also tested in grade 7.

Facts checked against NYSED pages on October 25, 2026.

What it is

The grade 7 standards have two clusters, both listed in the state's Educator Guide:

  • Informal comparative inferences about two populations: construct and interpret box plots, find the interquartile range, and decide if a data point is an outlier (NY-7.SP.1); judge how much two distributions overlap (NY-7.SP.3); use measures of center and variability to compare two populations (NY-7.SP.4).
  • Chance processes and probability models: find probabilities of compound events with organized lists, sample space tables and tree diagrams (NY-7.SP.8).

The state notes that grade 7 students are not expected to draw box plots with outliers, but are expected to read them. Grade 6 statistics standards are tested in grade 7 as well; see the grade 6 statistics guide.

Five things to check

  1. Median and range: for 4, 9, 2, 7, 8, can they put the numbers in order first, then find the median?
  2. Reading a box plot: where are the median and the two quartiles, and which group is more spread out?
  3. Comparing two groups: which has the higher center, and which varies more, and can they say so in a sentence?
  4. A list of outcomes: flip a coin and roll a number cube. How many outcomes are there in all?
  5. Probability as a fraction: what is the chance of heads and an even number?

What a gap looks like

  • Finding the median without ordering the numbers.
  • Confusing a bigger box with a bigger average: the box shows spread, the line inside it shows the median.
  • Adding probabilities when both things must happen, instead of listing outcomes or multiplying.
  • Leaving out outcomes because the list was not organised.

Probability leans on fractions: the chance of an event is a fraction of the outcomes. A fractions gap carries straight into this domain.

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Sources

Bridgil is not affiliated with or endorsed by the New York State Education Department or the Board of Regents. Numbers on this page can change each school year; check NYSED for the current ones.