San Bruno Park Elementary: 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	83,674	2445.5	− 2436	9.5	× 316 / 1655	1.8
4	83,677	2449.6	− 2485	−35.4	× 278 / 1655	−5.9
5	83,678	2497.7	− 2528	−30.3	× 275 / 1655	−5
6	83,681	2515.8	− 2552	−36.2	× 252 / 1655	−5.5
7	83,682	2534.7	− 2567	−32.3	× 288 / 1655	−5.6
8	83,685	2536.1	− 2586	−49.9	× 246 / 1655	−7.4
Sum, rounded to a whole point						−28

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	77,582	2434.2	− 2436	−1.8	× 281 / 1633	−0.3
4	77,584	2477.1	− 2485	−7.9	× 312 / 1633	−1.5
5	77,586	2479.1	− 2528	−48.9	× 280 / 1633	−8.4
6	77,588	2510.1	− 2552	−41.9	× 268 / 1633	−6.9
7	77,591	2554.4	− 2567	−12.6	× 246 / 1633	−1.9
8	77,593	2543.1	− 2586	−42.9	× 246 / 1633	−6.5
Sum, rounded to a whole point						−25

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	79,717	2434.3	− 2436	−1.7	× 274 / 1587	−0.3
4	79,720	2474.8	− 2485	−10.2	× 281 / 1587	−1.8
5	79,721	2507.2	− 2528	−20.8	× 274 / 1587	−3.6
6	79,723	2512.3	− 2552	−39.7	× 245 / 1587	−6.1
7	79,725	2554.1	− 2567	−12.9	× 262 / 1587	−2.1
8	79,727	2574.6	− 2586	−11.4	× 251 / 1587	−1.8
Sum, rounded to a whole point						−16

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	79,853	2437.0	− 2436	1	× 293 / 1631	0.2
4	79,854	2472.6	− 2485	−12.4	× 272 / 1631	−2.1
5	79,857	2488.1	− 2528	−39.9	× 276 / 1631	−6.8
6	79,858	2517.2	− 2552	−34.8	× 269 / 1631	−5.7
7	79,861	2529.6	− 2567	−37.4	× 252 / 1631	−5.8
8	79,862	2558.5	− 2586	−27.5	× 269 / 1631	−4.5
Sum, rounded to a whole point						−25

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	80,357	2431.4	− 2436	−4.6	× 269 / 1554	−0.8
4	80,358	2471.1	− 2485	−13.9	× 275 / 1554	−2.5
5	80,359	2478.8	− 2528	−49.2	× 259 / 1554	−8.2
6	80,360	2511.7	− 2552	−40.3	× 238 / 1554	−6.2
7	80,361	2520.8	− 2567	−46.2	× 259 / 1554	−7.7
8	80,362	2532.1	− 2586	−53.9	× 254 / 1554	−8.8
Sum, rounded to a whole point						−34

2021 from sb_ca2021_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	78,758	2407.5	− 2436	−28.5	× 222 / 1230	−5.1
4	78,759	2438.8	− 2485	−46.2	× 209 / 1230	−7.9
5	78,760	2470.5	− 2528	−57.5	× 222 / 1230	−10.4
6	78,761	2472.1	− 2552	−79.9	× 203 / 1230	−13.2
7	78,762	2500.1	− 2567	−66.9	× 182 / 1230	−9.9
8	78,763	2513.5	− 2586	−72.5	× 192 / 1230	−11.3
Sum, rounded to a whole point						−58

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	80,573	2432.6	− 2436	−3.4	× 222 / 1305	−0.6
4	80,574	2460.0	− 2485	−25	× 231 / 1305	−4.4
5	80,575	2482.9	− 2528	−45.1	× 219 / 1305	−7.6
6	80,576	2470.6	− 2552	−81.4	× 204 / 1305	−12.7
7	80,577	2493.1	− 2567	−73.9	× 222 / 1305	−12.6
8	80,578	2498.5	− 2586	−87.5	× 207 / 1305	−13.9
Sum, rounded to a whole point						−52

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	80,539	2442.6	− 2436	6.6	× 205 / 1252	1.1
4	80,540	2481.6	− 2485	−3.4	× 217 / 1252	−0.6
5	80,541	2500.8	− 2528	−27.2	× 214 / 1252	−4.6
6	80,542	2476.0	− 2552	−76	× 191 / 1252	−11.6
7	80,543	2494.1	− 2567	−72.9	× 201 / 1252	−11.7
8	80,544	2489.1	− 2586	−96.9	× 224 / 1252	−17.3
Sum, rounded to a whole point						−45

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	80,553	2458.8	− 2436	22.8	× 209 / 1186	4
4	80,554	2483.2	− 2485	−1.8	× 208 / 1186	−0.3
5	80,555	2509.6	− 2528	−18.4	× 211 / 1186	−3.3
6	80,556	2468.8	− 2552	−83.2	× 198 / 1186	−13.9
7	80,557	2499.0	− 2567	−68	× 179 / 1186	−10.3
8	80,558	2497.7	− 2586	−88.3	× 181 / 1186	−13.5
Sum, rounded to a whole point						−37

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	80,209	2445.2	− 2436	9.2	× 213 / 1221	1.6
4	80,210	2487.5	− 2485	2.5	× 213 / 1221	0.4
5	80,211	2506.6	− 2528	−21.4	× 210 / 1221	−3.7
6	80,212	2515.2	− 2552	−36.8	× 188 / 1221	−5.7
7	80,213	2493.6	− 2567	−73.4	× 200 / 1221	−12
8	80,214	2494.3	− 2586	−91.7	× 197 / 1221	−14.8
Sum, rounded to a whole point						−34

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −28, −25, −16, −25, −34, −58, −52, −45, −37, −34 → −35.4
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 3 · 2016→2017: 9 · 2017→2018: 9 · 2018→2019: 9 · 2019→2021: 24 · 2021→2022: 6 · 2022→2023: 7 · 2023→2024: 8 · 2024→2025: 3 → average 8.7
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 8.7 × 2.66 = 23.1. Upper limit −12.3, lower limit −58.5.

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.