Two Rock Union: math

The shaded band is this district'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	95,726	2449.7	− 2436	13.7	× 27 / 92	4
4	95,729	2466.9	− 2485	−18.1	× 24 / 92	−4.7
5	95,730	2499.1	− 2528	−28.9	× 24 / 92	−7.5
6	95,733	2515.9	− 2552	−36.1	× 17 / 92	−6.7
Sum, rounded to a whole point						−15

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	88,828	2460.3	− 2436	24.3	× 24 / 86	6.8
4	88,829	2481.9	− 2485	−3.1	× 19 / 86	−0.7
5	88,831	2493.9	− 2528	−34.1	× 23 / 86	−9.1
6	88,833	2496.1	− 2552	−55.9	× 20 / 86	−13
Sum, rounded to a whole point						−16

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	91,384	2465.1	− 2436	29.1	× 25 / 82	8.9
4	91,386	2504.6	− 2485	19.6	× 19 / 82	4.5
5	91,389	2551.0	− 2528	23	× 19 / 82	5.3
6	91,391	2494.3	− 2552	−57.7	× 19 / 82	−13.4
Sum, rounded to a whole point						5

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	91,577	2394.8	− 2436	−41.2	× 19 / 74	−10.6
4	91,580	2482.1	− 2485	−2.9	× 22 / 74	−0.9
5	91,581	2534.4	− 2528	6.4	× 17 / 74	1.5
6	91,584	2576.2	− 2552	24.2	× 16 / 74	5.2
Sum, rounded to a whole point						−5

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	92,222	2388.6	− 2436	−47.4	× 20 / 75	−12.6
4	92,223	2500.7	− 2485	15.7	× 21 / 75	4.4
5	92,224	2486.1	− 2528	−41.9	× 21 / 75	−11.7
6	92,225	2533.8	− 2552	−18.2	× 13 / 75	−3.2
Sum, rounded to a whole point						−23

2021 from sb_ca2021_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	90,264	2357.7	− 2436	−78.3	× 23 / 66	−27.3
4	90,265	2415.1	− 2485	−69.9	× 15 / 66	−15.9
5	90,266	2428.6	− 2528	−99.4	× 16 / 66	−24.1
6	90,267	2523.3	− 2552	−28.7	× 12 / 66	−5.2
Sum, rounded to a whole point						−72

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	92,472	2420.4	− 2436	−15.6	× 14 / 67	−3.3
4	92,473	2429.0	− 2485	−56	× 21 / 67	−17.6
5	92,474	2474.9	− 2528	−53.1	× 16 / 67	−12.7
6	92,475	2533.9	− 2552	−18.1	× 16 / 67	−4.3
Sum, rounded to a whole point						−38

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	92,380	2420.5	− 2436	−15.5	× 20 / 62	−5
4	92,381	2481.7	− 2485	−3.3	× 11 / 62	−0.6
5	92,382	2464.0	− 2528	−64	× 16 / 62	−16.5
6	92,383	2586.3	− 2552	34.3	× 15 / 62	8.3
Sum, rounded to a whole point						−14

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	92,277	2387.5	− 2436	−48.5	× 17 / 60	−13.7
4	92,278	2476.4	− 2485	−8.6	× 19 / 60	−2.7
5	92,279	2527.1	− 2528	−0.9	× 11 / 60	−0.2
6	92,280	2524.6	− 2552	−27.4	× 13 / 60	−5.9
Sum, rounded to a whole point						−23

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	91,995	2411.0	− 2436	−25	× 27 / 73	−9.2
4	91,996	2469.3	− 2485	−15.7	× 18 / 73	−3.9
5	91,997	2521.3	− 2528	−6.7	× 17 / 73	−1.6
6	91,998	2541.3	− 2552	−10.7	× 11 / 73	−1.6
Sum, rounded to a whole point						−16

2026 from sb_ca2026_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	91,612	2409.5	− 2436	−26.5	× 22 / 82	−7.1
4	91,613	2488.8	− 2485	3.8	× 24 / 82	1.1
5	91,614	2479.6	− 2528	−48.4	× 19 / 82	−11.2
6	91,615	2590.1	− 2552	38.1	× 17 / 82	7.9
Sum, rounded to a whole point						−9

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −15, −16, 5, −5, −23, −72, −38, −14, −23, −16, −9 → −20.5
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 1 · 2016→2017: 21 · 2017→2018: 10 · 2018→2019: 18 · 2019→2021: 49 · 2021→2022: 34 · 2022→2023: 24 · 2023→2024: 9 · 2024→2025: 7 · 2025→2026: 7 → average 18
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 18 × 2.66 = 47.9. Upper limit 27.4, lower limit −68.4.

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 — for a district, the total across its schools. From 2014–15, 2015–16, 2016–17, 2017–18, 2018–19, 2020–21, 2021–22, 2022–23, 2023–24, 2024–25, 2025–26.

Schools in Two Rock Union

Elementary schools

Two Rock Elementary