Tustin Unified: english

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	52,736	2431.2	− 2432	−0.8	× 1840 / 12985	−0.1
4	52,738	2481.5	− 2473	8.5	× 1762 / 12985	1.2
5	52,740	2516.6	− 2502	14.6	× 1904 / 12985	2.1
6	52,742	2533.3	− 2531	2.3	× 1918 / 12985	0.3
7	52,744	2557.6	− 2552	5.6	× 1825 / 12985	0.8
8	52,746	2581.1	− 2567	14.1	× 1903 / 12985	2.1
11	52,748	2621.8	− 2583	38.8	× 1833 / 12985	5.5
Sum, rounded to a whole point						12

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	48,982	2444.2	− 2432	12.2	× 1687 / 12932	1.6
4	48,983	2487.9	− 2473	14.9	× 1835 / 12932	2.1
5	48,986	2535.6	− 2502	33.6	× 1777 / 12932	4.6
6	48,987	2547.7	− 2531	16.7	× 1962 / 12932	2.5
7	48,989	2575.4	− 2552	23.4	× 1940 / 12932	3.5
8	48,991	2595.7	− 2567	28.7	× 1812 / 12932	4
11	48,993	2642.3	− 2583	59.3	× 1919 / 12932	8.8
Sum, rounded to a whole point						27

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	50,317	2437.8	− 2432	5.8	× 1665 / 12834	0.8
4	50,319	2487.2	− 2473	14.2	× 1714 / 12834	1.9
5	50,322	2524.5	− 2502	22.5	× 1849 / 12834	3.2
6	50,323	2556.5	− 2531	25.5	× 1812 / 12834	3.6
7	50,325	2574.2	− 2552	22.2	× 2008 / 12834	3.5
8	50,328	2598.0	− 2567	31	× 1943 / 12834	4.7
11	50,330	2643.7	− 2583	60.7	× 1843 / 12834	8.7
Sum, rounded to a whole point						26

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	50,342	2442.0	− 2432	10	× 1607 / 12724	1.3
4	50,344	2486.1	− 2473	13.1	× 1691 / 12724	1.7
5	50,346	2532.3	− 2502	30.3	× 1738 / 12724	4.1
6	50,348	2549.0	− 2531	18	× 1873 / 12724	2.6
7	50,350	2583.7	− 2552	31.7	× 1847 / 12724	4.6
8	50,352	2591.5	− 2567	24.5	× 1986 / 12724	3.8
11	50,354	2637.9	− 2583	54.9	× 1982 / 12724	8.6
Sum, rounded to a whole point						27

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	50,530	2442.2	− 2432	10.2	× 1590 / 12288	1.3
4	50,531	2488.3	− 2473	15.3	× 1601 / 12288	2
5	50,532	2526.2	− 2502	24.2	× 1708 / 12288	3.4
6	50,533	2554.3	− 2531	23.3	× 1789 / 12288	3.4
7	50,534	2581.9	− 2552	29.9	× 1871 / 12288	4.6
8	50,535	2595.4	− 2567	28.4	× 1843 / 12288	4.3
11	50,536	2627.1	− 2583	44.1	× 1886 / 12288	6.8
Sum, rounded to a whole point						26

2021 from sb_ca2021_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
11	49,267	2632.3	− 2583	49.3	× 1613 / 1613	49.3
Sum, rounded to a whole point						49

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	50,432	2437.0	− 2432	5	× 1434 / 11168	0.6
4	50,433	2478.4	− 2473	5.4	× 1538 / 11168	0.7
5	50,434	2526.1	− 2502	24.1	× 1509 / 11168	3.3
6	50,435	2541.0	− 2531	10	× 1552 / 11168	1.4
7	50,436	2572.0	− 2552	20	× 1561 / 11168	2.8
8	50,437	2580.8	− 2567	13.8	× 1783 / 11168	2.2
11	50,438	2637.4	− 2583	54.4	× 1791 / 11168	8.7
Sum, rounded to a whole point						20

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	50,392	2436.1	− 2432	4.1	× 1519 / 11091	0.6
4	50,393	2485.7	− 2473	12.7	× 1447 / 11091	1.7
5	50,394	2521.9	− 2502	19.9	× 1545 / 11091	2.8
6	50,395	2546.3	− 2531	15.3	× 1543 / 11091	2.1
7	50,396	2573.5	− 2552	21.5	× 1554 / 11091	3
8	50,397	2588.2	− 2567	21.2	× 1581 / 11091	3
11	50,398	2639.3	− 2583	56.3	× 1902 / 11091	9.7
Sum, rounded to a whole point						23

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	50,247	2437.9	− 2432	5.9	× 1419 / 11002	0.8
4	50,248	2483.7	− 2473	10.7	× 1533 / 11002	1.5
5	50,249	2525.0	− 2502	23	× 1513 / 11002	3.2
6	50,250	2550.0	− 2531	19	× 1604 / 11002	2.8
7	50,251	2581.0	− 2552	29	× 1565 / 11002	4.1
8	50,252	2592.9	− 2567	25.9	× 1561 / 11002	3.7
11	50,253	2650.1	− 2583	67.1	× 1807 / 11002	11
Sum, rounded to a whole point						27

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	50,003	2440.0	− 2432	8	× 1330 / 10896	1
4	50,004	2487.2	− 2473	14.2	× 1450 / 10896	1.9
5	50,005	2534.7	− 2502	32.7	× 1564 / 10896	4.7
6	50,006	2555.9	− 2531	24.9	× 1545 / 10896	3.5
7	50,007	2579.5	− 2552	27.5	× 1623 / 10896	4.1
8	50,008	2596.3	− 2567	29.3	× 1587 / 10896	4.3
11	50,009	2642.7	− 2583	59.7	× 1797 / 10896	9.8
Sum, rounded to a whole point						29

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. 12, 27, 26, 27, 26, 49, 20, 23, 27, 29 → 26.6
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 15 · 2016→2017: 1 · 2017→2018: 1 · 2018→2019: 1 · 2019→2021: 23 · 2021→2022: 29 · 2022→2023: 3 · 2023→2024: 4 · 2024→2025: 2 → average 8.8
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 8.8 × 2.66 = 23.4. Upper limit 50, lower limit 3.2.

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 — 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.