Robert Fulton College Preparatory: 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
6	32,898	2431.0	− 2552	−121	× 268 / 1062	−30.5
7	32,899	2428.4	− 2567	−138.6	× 313 / 1062	−40.8
8	32,902	2453.6	− 2586	−132.4	× 303 / 1062	−37.8
11	32,903	2511.3	− 2628	−116.7	× 178 / 1062	−19.6
Sum, rounded to a whole point						−129

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	31,111	2436.8	− 2552	−115.2	× 271 / 1042	−30
7	31,113	2437.8	− 2567	−129.2	× 274 / 1042	−34
8	31,115	2454.0	− 2586	−132	× 329 / 1042	−41.7
11	31,118	2546.5	− 2628	−81.5	× 168 / 1042	−13.1
Sum, rounded to a whole point						−119

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	31,673	2425.5	− 2552	−126.5	× 264 / 1026	−32.5
7	31,675	2432.1	− 2567	−134.9	× 287 / 1026	−37.7
8	31,676	2439.0	− 2586	−147	× 294 / 1026	−42.1
11	31,678	2543.4	− 2628	−84.6	× 181 / 1026	−14.9
Sum, rounded to a whole point						−127

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	31,717	2418.1	− 2552	−133.9	× 243 / 947	−34.4
7	31,719	2421.1	− 2567	−145.9	× 253 / 947	−39
8	31,721	2432.4	− 2586	−153.6	× 288 / 947	−46.7
11	31,723	2483.3	− 2628	−144.7	× 163 / 947	−24.9
Sum, rounded to a whole point						−145

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	31,896	2429.4	− 2552	−122.6	× 236 / 861	−33.6
7	31,897	2438.5	− 2567	−128.5	× 226 / 861	−33.7
8	31,898	2452.1	− 2586	−133.9	× 236 / 861	−36.7
11	31,899	2513.4	− 2628	−114.6	× 163 / 861	−21.7
Sum, rounded to a whole point						−126

2021 from sb_ca2021_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
11	31,102	2545.6	− 2628	−82.4	× 113 / 113	−82.4
Sum, rounded to a whole point						−82

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	31,923	2411.5	− 2552	−140.5	× 223 / 755	−41.5
7	31,924	2427.0	− 2567	−140	× 203 / 755	−37.6
8	31,925	2428.0	− 2586	−158	× 227 / 755	−47.5
11	31,926	2496.8	− 2628	−131.2	× 102 / 755	−17.7
Sum, rounded to a whole point						−144

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	31,980	2430.9	− 2552	−121.1	× 232 / 779	−36.1
7	31,981	2430.2	− 2567	−136.8	× 228 / 779	−40
8	31,982	2409.7	− 2586	−176.3	× 210 / 779	−47.5
11	31,983	2493.5	− 2628	−134.5	× 109 / 779	−18.8
Sum, rounded to a whole point						−142

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	31,846	2410.6	− 2552	−141.4	× 203 / 808	−35.5
7	31,847	2436.7	− 2567	−130.3	× 232 / 808	−37.4
8	31,848	2434.0	− 2586	−152	× 239 / 808	−45
11	31,849	2522.9	− 2628	−105.1	× 134 / 808	−17.4
Sum, rounded to a whole point						−135

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	31,705	2427.5	− 2552	−124.5	× 199 / 769	−32.2
7	31,706	2448.9	− 2567	−118.1	× 194 / 769	−29.8
8	31,707	2451.2	− 2586	−134.8	× 235 / 769	−41.2
11	31,708	2485.7	− 2628	−142.3	× 141 / 769	−26.1
Sum, rounded to a whole point						−129

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −129, −119, −127, −145, −126, −82, −144, −142, −135, −129 → −127.8
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 10 · 2016→2017: 8 · 2017→2018: 18 · 2018→2019: 19 · 2019→2021: 44 · 2021→2022: 62 · 2022→2023: 2 · 2023→2024: 7 · 2024→2025: 6 → average 19.6
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 19.6 × 2.66 = 52.1. Upper limit −75.7, lower limit −179.9.

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.