Mueller Charter (Robert L.): english

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	70,731	2401.2	− 2432	−30.8	× 131 / 629	−6.4
4	70,732	2450.4	− 2473	−22.6	× 111 / 629	−4
5	70,735	2505.0	− 2502	3	× 95 / 629	0.5
6	70,736	2519.3	− 2531	−11.7	× 110 / 629	−2
7	70,739	2545.1	− 2552	−6.9	× 95 / 629	−1
8	70,740	2596.0	− 2567	29	× 87 / 629	4
Sum, rounded to a whole point						−9

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	65,559	2443.9	− 2432	11.9	× 134 / 671	2.4
4	65,562	2463.1	− 2473	−9.9	× 129 / 671	−1.9
5	65,563	2507.7	− 2502	5.7	× 113 / 671	1
6	65,566	2523.4	− 2531	−7.6	× 110 / 671	−1.2
7	65,567	2576.0	− 2552	24	× 92 / 671	3.3
8	65,570	2605.3	− 2567	38.3	× 93 / 671	5.3
Sum, rounded to a whole point						9

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	67,375	2440.0	− 2432	8	× 115 / 729	1.3
4	67,377	2467.8	− 2473	−5.2	× 130 / 729	−0.9
5	67,380	2505.6	− 2502	3.6	× 121 / 729	0.6
6	67,381	2530.3	− 2531	−0.7	× 112 / 729	−0.1
7	67,384	2567.9	− 2552	15.9	× 87 / 729	1.9
8	67,386	2625.8	− 2567	58.8	× 82 / 729	6.6
11	67,387	2636.0	− 2583	53	× 82 / 729	6
Sum, rounded to a whole point						15

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	67,481	2457.2	− 2432	25.2	× 107 / 733	3.7
4	67,483	2477.6	− 2473	4.6	× 114 / 733	0.7
5	67,485	2505.4	− 2502	3.4	× 125 / 733	0.6
6	67,487	2535.0	− 2531	4	× 125 / 733	0.7
7	67,489	2568.2	− 2552	16.2	× 96 / 733	2.1
8	67,491	2605.9	− 2567	38.9	× 79 / 733	4.2
11	67,493	2649.9	− 2583	66.9	× 87 / 733	7.9
Sum, rounded to a whole point						20

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	67,992	2451.3	− 2432	19.3	× 120 / 807	2.9
4	67,993	2467.7	− 2473	−5.3	× 118 / 807	−0.8
5	67,994	2500.4	− 2502	−1.6	× 116 / 807	−0.2
6	67,995	2535.2	− 2531	4.2	× 140 / 807	0.7
7	67,996	2566.1	− 2552	14.1	× 102 / 807	1.8
8	67,997	2615.7	− 2567	48.7	× 89 / 807	5.4
11	67,998	2595.8	− 2583	12.8	× 122 / 807	1.9
Sum, rounded to a whole point						12

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	68,120	2409.4	− 2432	−22.6	× 115 / 810	−3.2
4	68,121	2455.7	− 2473	−17.3	× 120 / 810	−2.6
5	68,122	2475.1	− 2502	−26.9	× 129 / 810	−4.3
6	68,123	2510.1	− 2531	−20.9	× 123 / 810	−3.2
7	68,124	2540.2	− 2552	−11.8	× 93 / 810	−1.4
8	68,125	2557.0	− 2567	−10	× 94 / 810	−1.2
11	68,126	2603.7	− 2583	20.7	× 136 / 810	3.5
Sum, rounded to a whole point						−12

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	68,138	2400.8	− 2432	−31.2	× 113 / 831	−4.2
4	68,139	2437.5	− 2473	−35.5	× 115 / 831	−4.9
5	68,140	2478.7	− 2502	−23.3	× 128 / 831	−3.6
6	68,141	2503.8	− 2531	−27.2	× 125 / 831	−4.1
7	68,142	2550.6	− 2552	−1.4	× 107 / 831	−0.2
8	68,143	2540.4	− 2567	−26.6	× 93 / 831	−3
11	68,144	2629.8	− 2583	46.8	× 150 / 831	8.4
Sum, rounded to a whole point						−12

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	68,132	2410.9	− 2432	−21.1	× 114 / 793	−3
4	68,133	2440.0	− 2473	−33	× 119 / 793	−5
5	68,134	2496.8	− 2502	−5.2	× 107 / 793	−0.7
6	68,135	2509.6	− 2531	−21.4	× 124 / 793	−3.3
7	68,136	2555.6	− 2552	3.6	× 102 / 793	0.5
8	68,137	2568.2	− 2567	1.2	× 104 / 793	0.2
11	68,138	2613.3	− 2583	30.3	× 123 / 793	4.7
Sum, rounded to a whole point						−7

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	67,900	2405.8	− 2432	−26.2	× 98 / 809	−3.2
4	67,901	2442.3	− 2473	−30.7	× 116 / 809	−4.4
5	67,902	2489.5	− 2502	−12.5	× 127 / 809	−2
6	67,903	2537.2	− 2531	6.2	× 112 / 809	0.9
7	67,904	2564.3	− 2552	12.3	× 113 / 809	1.7
8	67,905	2567.6	− 2567	0.6	× 110 / 809	0.1
11	67,906	2629.5	− 2583	46.5	× 133 / 809	7.6
Sum, rounded to a whole point						1

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −9, 9, 15, 20, 12, −12, −12, −7, 1 → 1.9
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 18 · 2016→2017: 6 · 2017→2018: 5 · 2018→2019: 8 · 2019→2022: 24 · 2022→2023: 0 · 2023→2024: 5 · 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 26.6, lower limit −22.8.

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.