Mountain Valley Unified: 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	99,940	2393.4	− 2436	−42.6	× 19 / 155	−5.2
4	99,942	2459.2	− 2485	−25.8	× 21 / 155	−3.5
5	99,944	2501.9	− 2528	−26.1	× 23 / 155	−3.9
6	99,947	2474.9	− 2552	−77.1	× 23 / 155	−11.4
7	99,948	2557.5	− 2567	−9.5	× 25 / 155	−1.5
8	99,950	2615.2	− 2586	29.2	× 18 / 155	3.4
11	99,953	2545.0	− 2628	−83	× 26 / 155	−13.9
Sum, rounded to a whole point						−36

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	92,668	2405.8	− 2436	−30.2	× 27 / 154	−5.3
4	92,671	2463.5	− 2485	−21.5	× 21 / 154	−2.9
5	92,672	2486.4	− 2528	−41.6	× 20 / 154	−5.4
6	92,675	2530.4	− 2552	−21.6	× 23 / 154	−3.2
7	92,677	2531.7	− 2567	−35.3	× 23 / 154	−5.3
8	92,678	2615.0	− 2586	29	× 19 / 154	3.6
11	92,681	2557.2	− 2628	−70.8	× 21 / 154	−9.7
Sum, rounded to a whole point						−28

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	95,438	2403.5	− 2436	−32.5	× 22 / 146	−4.9
4	95,440	2460.1	− 2485	−24.9	× 26 / 146	−4.4
5	95,442	2495.8	− 2528	−32.2	× 21 / 146	−4.6
6	95,445	2499.8	− 2552	−52.2	× 20 / 146	−7.2
7	95,446	2590.0	− 2567	23	× 19 / 146	3
8	95,449	2551.2	− 2586	−34.8	× 24 / 146	−5.7
11	95,451	2558.6	− 2628	−69.4	× 14 / 146	−6.7
Sum, rounded to a whole point						−30

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	95,608	2409.6	− 2436	−26.4	× 13 / 144	−2.4
4	95,611	2415.1	− 2485	−69.9	× 28 / 144	−13.6
5	95,612	2475.2	− 2528	−52.8	× 27 / 144	−9.9
6	95,615	2497.2	− 2552	−54.8	× 19 / 144	−7.2
7	95,616	2562.6	− 2567	−4.4	× 21 / 144	−0.6
8	95,619	2613.5	− 2586	27.5	× 20 / 144	3.8
11	95,620	2580.6	− 2628	−47.4	× 16 / 144	−5.3
Sum, rounded to a whole point						−35

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	96,293	2432.4	− 2436	−3.6	× 16 / 143	−0.4
4	96,294	2473.4	− 2485	−11.6	× 12 / 143	−1
5	96,295	2463.2	− 2528	−64.8	× 27 / 143	−12.2
6	96,296	2522.8	− 2552	−29.2	× 30 / 143	−6.1
7	96,297	2598.3	− 2567	31.3	× 17 / 143	3.7
8	96,298	2659.3	− 2586	73.3	× 21 / 143	10.8
11	96,299	2528.9	− 2628	−99.1	× 20 / 143	−13.9
Sum, rounded to a whole point						−19

2021 from sb_ca2021_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	94,198	2433.1	− 2436	−2.9	× 24 / 154	−0.5
4	94,199	2495.2	− 2485	10.2	× 19 / 154	1.3
5	94,200	2488.7	− 2528	−39.3	× 18 / 154	−4.6
6	94,201	2571.2	− 2552	19.2	× 17 / 154	2.1
7	94,202	2570.9	− 2567	3.9	× 27 / 154	0.7
8	94,203	2622.5	− 2586	36.5	× 24 / 154	5.7
11	94,204	2574.2	− 2628	−53.8	× 25 / 154	−8.7
Sum, rounded to a whole point						−4

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	96,467	2458.3	− 2436	22.3	× 21 / 142	3.3
4	96,468	2473.3	− 2485	−11.7	× 24 / 142	−2
5	96,469	2520.7	− 2528	−7.3	× 19 / 142	−1
6	96,470	2522.2	− 2552	−29.8	× 19 / 142	−4
7	96,471	2631.1	− 2567	64.1	× 18 / 142	8.1
8	96,472	2612.3	− 2586	26.3	× 22 / 142	4.1
11	96,473	2605.9	− 2628	−22.1	× 19 / 142	−3
Sum, rounded to a whole point						6

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	96,306	2460.8	− 2436	24.8	× 24 / 150	4
4	96,307	2462.6	− 2485	−22.4	× 23 / 150	−3.4
5	96,308	2515.1	− 2528	−12.9	× 24 / 150	−2.1
6	96,309	2571.3	− 2552	19.3	× 19 / 150	2.4
7	96,310	2566.6	− 2567	−0.4	× 19 / 150	−0.1
8	96,311	2663.7	− 2586	77.7	× 21 / 150	10.9
11	96,312	2565.3	− 2628	−62.7	× 20 / 150	−8.4
Sum, rounded to a whole point						3

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	96,182	2459.1	− 2436	23.1	× 30 / 165	4.2
4	96,183	2484.5	− 2485	−0.5	× 24 / 165	−0.1
5	96,184	2528.9	− 2528	0.9	× 25 / 165	0.1
6	96,185	2546.1	− 2552	−5.9	× 23 / 165	−0.8
7	96,186	2601.1	− 2567	34.1	× 19 / 165	3.9
8	96,187	2616.1	− 2586	30.1	× 18 / 165	3.3
11	96,188	2592.0	− 2628	−36	× 26 / 165	−5.7
Sum, rounded to a whole point						5

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	95,928	2418.7	− 2436	−17.3	× 28 / 175	−2.8
4	95,929	2496.5	− 2485	11.5	× 28 / 175	1.8
5	95,930	2510.5	− 2528	−17.5	× 28 / 175	−2.8
6	95,931	2528.5	− 2552	−23.5	× 28 / 175	−3.8
7	95,932	2557.7	− 2567	−9.3	× 21 / 175	−1.1
8	95,933	2630.9	− 2586	44.9	× 20 / 175	5.1
11	95,934	2635.9	− 2628	7.9	× 22 / 175	1
Sum, rounded to a whole point						−2

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −36, −28, −30, −35, −19, −4, 6, 3, 5, −2 → −14
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 8 · 2016→2017: 2 · 2017→2018: 5 · 2018→2019: 16 · 2019→2021: 15 · 2021→2022: 10 · 2022→2023: 3 · 2023→2024: 2 · 2024→2025: 7 → average 7.6
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 7.6 × 2.66 = 20.2. Upper limit 6.2, lower limit −34.2.

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.