Wilhelmina Henry 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.

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	80,496	2365.0	− 2436	−71	× 119 / 593	−14.2
4	80,497	2409.4	− 2485	−75.6	× 97 / 593	−12.4
5	80,500	2417.9	− 2528	−110.1	× 96 / 593	−17.8
6	80,501	2448.2	− 2552	−103.8	× 96 / 593	−16.8
7	80,504	2490.0	− 2567	−77	× 91 / 593	−11.8
8	80,505	2469.1	− 2586	−116.9	× 94 / 593	−18.5
Sum, rounded to a whole point						−92

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	74,597	2379.2	− 2436	−56.8	× 117 / 589	−11.3
4	74,599	2426.2	− 2485	−58.8	× 99 / 589	−9.9
5	74,601	2443.5	− 2528	−84.5	× 97 / 589	−13.9
6	74,602	2461.5	− 2552	−90.5	× 92 / 589	−14.1
7	74,605	2454.0	− 2567	−113	× 94 / 589	−18
8	74,606	2512.1	− 2586	−73.9	× 90 / 589	−11.3
Sum, rounded to a whole point						−79

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	76,581	2379.9	− 2436	−56.1	× 87 / 572	−8.5
4	76,583	2415.0	− 2485	−70	× 120 / 572	−14.7
5	76,586	2429.8	− 2528	−98.2	× 95 / 572	−16.3
6	76,588	2480.7	− 2552	−71.3	× 90 / 572	−11.2
7	76,590	2444.7	− 2567	−122.3	× 92 / 572	−19.7
8	76,592	2464.1	− 2586	−121.9	× 88 / 572	−18.8
Sum, rounded to a whole point						−89

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	76,764	2414.6	− 2436	−21.4	× 79 / 585	−2.9
4	76,767	2418.8	− 2485	−66.2	× 94 / 585	−10.6
5	76,768	2429.2	− 2528	−98.8	× 126 / 585	−21.3
6	76,771	2458.8	− 2552	−93.2	× 97 / 585	−15.5
7	76,772	2477.5	− 2567	−89.5	× 95 / 585	−14.5
8	76,775	2475.0	− 2586	−111	× 94 / 585	−17.8
Sum, rounded to a whole point						−83

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	77,271	2399.9	− 2436	−36.1	× 93 / 583	−5.8
4	77,272	2446.8	− 2485	−38.2	× 93 / 583	−6.1
5	77,273	2419.9	− 2528	−108.1	× 91 / 583	−16.9
6	77,274	2460.3	− 2552	−91.7	× 119 / 583	−18.7
7	77,275	2469.1	− 2567	−97.9	× 94 / 583	−15.8
8	77,276	2479.7	− 2586	−106.3	× 93 / 583	−17
Sum, rounded to a whole point						−80

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	77,423	2361.8	− 2436	−74.2	× 91 / 565	−12
4	77,424	2391.3	− 2485	−93.7	× 91 / 565	−15.1
5	77,425	2406.6	− 2528	−121.4	× 112 / 565	−24.1
6	77,426	2424.3	− 2552	−127.7	× 95 / 565	−21.5
7	77,427	2466.8	− 2567	−100.2	× 90 / 565	−16
8	77,428	2457.1	− 2586	−128.9	× 86 / 565	−19.6
Sum, rounded to a whole point						−108

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	77,409	2356.5	− 2436	−79.5	× 86 / 586	−11.7
4	77,410	2411.2	− 2485	−73.8	× 97 / 586	−12.2
5	77,411	2393.6	− 2528	−134.4	× 95 / 586	−21.8
6	77,412	2426.3	− 2552	−125.7	× 121 / 586	−26
7	77,413	2435.5	− 2567	−131.5	× 93 / 586	−20.9
8	77,414	2466.0	− 2586	−120	× 94 / 586	−19.2
Sum, rounded to a whole point						−112

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	77,409	2365.6	− 2436	−70.4	× 93 / 580	−11.3
4	77,410	2399.7	− 2485	−85.3	× 89 / 580	−13.1
5	77,411	2416.5	− 2528	−111.5	× 97 / 580	−18.6
6	77,412	2409.9	− 2552	−142.1	× 88 / 580	−21.6
7	77,413	2447.1	− 2567	−119.9	× 122 / 580	−25.2
8	77,414	2457.5	− 2586	−128.5	× 91 / 580	−20.2
Sum, rounded to a whole point						−110

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	77,063	2401.9	− 2436	−34.1	× 93 / 582	−5.4
4	77,064	2385.1	− 2485	−99.9	× 93 / 582	−16
5	77,065	2392.3	− 2528	−135.7	× 95 / 582	−22.2
6	77,066	2443.3	− 2552	−108.7	× 95 / 582	−17.7
7	77,067	2453.1	− 2567	−113.9	× 86 / 582	−16.8
8	77,068	2467.9	− 2586	−118.1	× 120 / 582	−24.4
Sum, rounded to a whole point						−102

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −92, −79, −89, −83, −80, −108, −112, −110, −102 → −95
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 13 · 2016→2017: 10 · 2017→2018: 6 · 2018→2019: 3 · 2019→2022: 28 · 2022→2023: 4 · 2023→2024: 2 · 2024→2025: 8 → average 9.3
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 9.3 × 2.66 = 24.7. Upper limit −70.3, lower limit −119.7.

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.