Woodbridge: math · Schoolio

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.

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	79,238	2433.3	− 2436	−2.7	× 49 / 240	−0.6
4	79,241	2465.9	− 2485	−19.1	× 66 / 240	−5.3
5	79,242	2472.7	− 2528	−55.3	× 63 / 240	−14.5
6	79,245	2489.0	− 2552	−63	× 62 / 240	−16.3
Sum, rounded to a whole point						−37

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	73,427	2427.7	− 2436	−8.3	× 59 / 237	−2.1
4	73,429	2466.9	− 2485	−18.1	× 50 / 237	−3.8
5	73,430	2484.7	− 2528	−43.3	× 67 / 237	−12.2
6	73,432	2463.9	− 2552	−88.1	× 61 / 237	−22.7
Sum, rounded to a whole point						−41

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	75,383	2415.7	− 2436	−20.3	× 63 / 237	−5.4
4	75,385	2460.4	− 2485	−24.6	× 60 / 237	−6.2
5	75,387	2468.4	− 2528	−59.6	× 54 / 237	−13.6
6	75,390	2471.7	− 2552	−80.3	× 60 / 237	−20.3
Sum, rounded to a whole point						−46

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	75,578	2433.5	− 2436	−2.5	× 44 / 220	−0.5
4	75,580	2457.5	− 2485	−27.5	× 71 / 220	−8.9
5	75,582	2463.6	− 2528	−64.4	× 55 / 220	−16.1
6	75,584	2480.6	− 2552	−71.4	× 50 / 220	−16.2
Sum, rounded to a whole point						−42

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	76,105	2443.5	− 2436	7.5	× 54 / 224	1.8
4	76,106	2460.0	− 2485	−25	× 46 / 224	−5.1
5	76,107	2481.1	− 2528	−46.9	× 72 / 224	−15.1
6	76,108	2503.0	− 2552	−49	× 52 / 224	−11.4
Sum, rounded to a whole point						−30

2021 from sb_ca2021_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	74,664	2390.7	− 2436	−45.3	× 36 / 172	−9.5
4	74,665	2375.9	− 2485	−109.1	× 45 / 172	−28.5
5	74,666	2442.7	− 2528	−85.3	× 43 / 172	−21.3
6	74,667	2468.1	− 2552	−83.9	× 48 / 172	−23.4
Sum, rounded to a whole point						−83

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	76,251	2391.2	− 2436	−44.8	× 48 / 190	−11.3
4	76,252	2402.2	− 2485	−82.8	× 34 / 190	−14.8
5	76,253	2411.7	− 2528	−116.3	× 54 / 190	−33.1
6	76,254	2473.6	− 2552	−78.4	× 54 / 190	−22.3
Sum, rounded to a whole point						−81

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	76,233	2442.1	− 2436	6.1	× 61 / 213	1.7
4	76,234	2446.4	− 2485	−38.6	× 57 / 213	−10.3
5	76,235	2421.5	− 2528	−106.5	× 39 / 213	−19.5
6	76,236	2443.0	− 2552	−109	× 56 / 213	−28.7
Sum, rounded to a whole point						−57

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	76,228	2385.5	− 2436	−50.5	× 57 / 215	−13.4
4	76,229	2456.3	− 2485	−28.7	× 62 / 215	−8.3
5	76,230	2438.3	− 2528	−89.7	× 58 / 215	−24.2
6	76,231	2429.0	− 2552	−123	× 38 / 215	−21.7
Sum, rounded to a whole point						−68

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	75,901	2397.3	− 2436	−38.7	× 55 / 244	−8.7
4	75,902	2424.8	− 2485	−60.2	× 59 / 244	−14.6
5	75,903	2467.7	− 2528	−60.3	× 62 / 244	−15.3
6	75,904	2461.7	− 2552	−90.3	× 68 / 244	−25.2
Sum, rounded to a whole point						−64

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −37, −41, −46, −42, −30, −83, −81, −57, −68, −64 → −54.9
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 4 · 2016→2017: 5 · 2017→2018: 4 · 2018→2019: 12 · 2019→2021: 53 · 2021→2022: 2 · 2022→2023: 24 · 2023→2024: 11 · 2024→2025: 4 → average 13.2
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 13.2 × 2.66 = 35.1. Upper limit −19.8, lower limit −90.

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.