Rancho Cucamonga Middle: 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	65,576	2454.3	− 2552	−97.7	× 243 / 776	−30.6
7	65,578	2493.4	− 2567	−73.6	× 266 / 776	−25.2
8	65,580	2497.7	− 2586	−88.3	× 267 / 776	−30.4
Sum, rounded to a whole point						−86

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	60,805	2473.8	− 2552	−78.2	× 261 / 766	−26.6
7	60,807	2516.1	− 2567	−50.9	× 241 / 766	−16
8	60,809	2536.7	− 2586	−49.3	× 264 / 766	−17
Sum, rounded to a whole point						−60

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	62,559	2473.8	− 2552	−78.2	× 235 / 730	−25.2
7	62,562	2508.9	− 2567	−58.1	× 259 / 730	−20.6
8	62,564	2534.9	− 2586	−51.1	× 236 / 730	−16.5
Sum, rounded to a whole point						−62

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	62,639	2467.2	− 2552	−84.8	× 268 / 739	−30.8
7	62,641	2510.9	− 2567	−56.1	× 226 / 739	−17.2
8	62,643	2517.6	− 2586	−68.4	× 245 / 739	−22.7
Sum, rounded to a whole point						−71

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	62,908	2454.8	− 2552	−97.2	× 256 / 739	−33.7
7	62,909	2504.2	− 2567	−62.8	× 270 / 739	−22.9
8	62,910	2543.4	− 2586	−42.6	× 213 / 739	−12.3
Sum, rounded to a whole point						−69

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	62,971	2462.8	− 2552	−89.2	× 223 / 730	−27.2
7	62,972	2474.6	− 2567	−92.4	× 248 / 730	−31.4
8	62,973	2474.0	− 2586	−112	× 259 / 730	−39.7
Sum, rounded to a whole point						−98

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	62,919	2452.4	− 2552	−99.6	× 241 / 699	−34.3
7	62,920	2471.6	− 2567	−95.4	× 224 / 699	−30.6
8	62,921	2473.0	− 2586	−113	× 234 / 699	−37.8
Sum, rounded to a whole point						−103

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	62,878	2447.7	− 2552	−104.3	× 265 / 725	−38.1
7	62,879	2473.5	− 2567	−93.5	× 241 / 725	−31.1
8	62,880	2480.5	− 2586	−105.5	× 219 / 725	−31.9
Sum, rounded to a whole point						−101

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	62,649	2465.0	− 2552	−87	× 251 / 753	−29
7	62,650	2483.1	− 2567	−83.9	× 262 / 753	−29.2
8	62,651	2493.4	− 2586	−92.6	× 240 / 753	−29.5
Sum, rounded to a whole point						−88

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −86, −60, −62, −71, −69, −98, −103, −101, −88 → −82
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 26 · 2016→2017: 2 · 2017→2018: 9 · 2018→2019: 2 · 2019→2022: 29 · 2022→2023: 5 · 2023→2024: 2 · 2024→2025: 13 → average 11
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 11 × 2.66 = 29.3. Upper limit −52.7, lower limit −111.3.

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.