Rio Plaza Elementary: math

The shaded band is this school's normal range. If nothing about how it works changes, nearly every future year should land inside it. Zero means the typical student just meets the state standard. The small numbers under the years are how many students were tested.

Measured against the grade 3 bar

The state's math test uses one scale for every grade, so a score means the same thing in grade 3 as in grade 5.

Many students here are still learning English. The math test is written in English, with some translation help, and many of its questions are word problems. In 2026, 136 of the 195 students who took the math test were English learners.

All students

3rd The average 3rd grader scores 66 points under the grade 3 bar. 2371 vs. 2436.
4th The average 4th grader scores 53 points under the grade 3 bar. 2383 vs. 2436. The 4th-grade bar is 2485.
5th The average 5th grader scores 15 points under the grade 3 bar. 2421 vs. 2436. The 5th-grade bar is 2528.

Students fluent in English

Math with English out of the way. Includes students who have only ever spoken English.

Grade bars 3rd 21 students 15 points under the grade 3 bar. 4th 13 students 17 points under the grade 3 bar. 5th 25 students 25 points under the grade 4 bar.

English learners

Students leave this group as they become fluent, so its average stays low even where they learn well.

Grade bars 3rd 47 students 88 points under the grade 3 bar. 4th 43 students 64 points under the grade 3 bar. 5th 46 students 36 points under the grade 3 bar.

the group's average that grade's own bar the distance between

2026 results. "Meets standard" is the state's mark for being on track for that grade. The state leaves out any group of ten students or fewer, so a grade may be missing from the charts.

Step 1 · Each year's result

For each grade tested, take the average (mean) scale score from the California Department of Education's results file, and subtract the lowest score that counts as "Standard Met" for that grade. That is the grade's distance from standard. Weight each grade by its share of the students tested, then add the grades up. Grades where the state hides the average because ten or fewer students tested are left out entirely.

2015 from sb_ca2015_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	103,922	2399.8	− 2436	−36.2	× 94 / 266	−12.8
4	103,923	2397.7	− 2485	−87.3	× 90 / 266	−29.5
5	103,926	2436.2	− 2528	−91.8	× 82 / 266	−28.3
Sum, rounded to a whole point						−71

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	96,569	2394.3	− 2436	−41.7	× 82 / 269	−12.7
4	96,571	2405.1	− 2485	−79.9	× 100 / 269	−29.7
5	96,574	2421.9	− 2528	−106.1	× 87 / 269	−34.3
Sum, rounded to a whole point						−77

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	99,371	2404.4	− 2436	−31.6	× 87 / 261	−10.5
4	99,373	2420.6	− 2485	−64.4	× 80 / 261	−19.7
5	99,375	2438.6	− 2528	−89.4	× 94 / 261	−32.2
Sum, rounded to a whole point						−62

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	99,529	2409.5	− 2436	−26.5	× 95 / 268	−9.4
4	99,531	2417.2	− 2485	−67.8	× 85 / 268	−21.5
5	99,533	2436.5	− 2528	−91.5	× 88 / 268	−30
Sum, rounded to a whole point						−61

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	100,194	2400.6	− 2436	−35.4	× 96 / 277	−12.3
4	100,195	2439.3	− 2485	−45.7	× 93 / 277	−15.3
5	100,196	2430.1	− 2528	−97.9	× 88 / 277	−31.1
Sum, rounded to a whole point						−59

2021 from sb_ca2021_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	98,057	2350.8	− 2436	−85.2	× 77 / 249	−26.3
4	98,058	2364.2	− 2485	−120.8	× 78 / 249	−37.8
5	98,059	2387.5	− 2528	−140.5	× 94 / 249	−53
Sum, rounded to a whole point						−117

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	100,433	2382.7	− 2436	−53.3	× 79 / 239	−17.6
4	100,434	2401.9	− 2485	−83.1	× 75 / 239	−26.1
5	100,435	2404.4	− 2528	−123.6	× 85 / 239	−44
Sum, rounded to a whole point						−88

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	100,269	2371.5	− 2436	−64.5	× 81 / 235	−22.2
4	100,270	2412.9	− 2485	−72.1	× 78 / 235	−23.9
5	100,271	2426.1	− 2528	−101.9	× 76 / 235	−33
Sum, rounded to a whole point						−79

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	100,142	2346.8	− 2436	−89.2	× 71 / 231	−27.4
4	100,143	2409.9	− 2485	−75.1	× 79 / 231	−25.7
5	100,144	2438.3	− 2528	−89.7	× 81 / 231	−31.5
Sum, rounded to a whole point						−85

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	99,842	2342.6	− 2436	−93.4	× 57 / 205	−26
4	99,843	2393.6	− 2485	−91.4	× 69 / 205	−30.8
5	99,844	2419.2	− 2528	−108.8	× 79 / 205	−41.9
Sum, rounded to a whole point						−99

2026 from sb_ca2026_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	99,505	2370.5	− 2436	−65.5	× 68 / 195	−22.8
4	99,506	2382.8	− 2485	−102.2	× 56 / 195	−29.3
5	99,507	2420.9	− 2528	−107.1	× 71 / 195	−39
Sum, rounded to a whole point						−91

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −71, −77, −62, −61, −59, −117, −88, −79, −85, −99, −91 → −80.8
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 6 · 2016→2017: 15 · 2017→2018: 1 · 2018→2019: 2 · 2019→2021: 58 · 2021→2022: 29 · 2022→2023: 9 · 2023→2024: 6 · 2024→2025: 14 · 2025→2026: 8 → average 14.8
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 14.8 × 2.66 = 39.4. Upper limit −41.4, lower limit −120.2.

Why 2.66? It is the standard factor from quality control, the work of Walter Shewhart and W. Edwards Deming. It turns "how much the result typically changes in a year" into "how far it can wander by chance alone".

Years with no result (no state tests were given in spring 2020) are skipped: the year-to-year change runs from the last year with a result to the next one.

Step 3 · Free or reduced-price meals

The share of enrolled students eligible for free or reduced-price meals. From 2014–15, 2015–16, 2016–17, 2017–18, 2018–19, 2020–21, 2021–22, 2022–23, 2023–24, 2024–25, 2025–26.