Corona-Norco Unified: english

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	55,632	2421.6	− 2432	−10.4	× 3917 / 27946	−1.5
4	55,634	2466.5	− 2473	−6.5	× 3971 / 27946	−0.9
5	55,636	2509.3	− 2502	7.3	× 3948 / 27946	1
6	55,638	2539.8	− 2531	8.8	× 4079 / 27946	1.3
7	55,640	2551.2	− 2552	−0.8	× 4010 / 27946	−0.1
8	55,642	2570.5	− 2567	3.5	× 3858 / 27946	0.5
11	55,644	2602.0	− 2583	19	× 4163 / 27946	2.8
Sum, rounded to a whole point						3

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	51,654	2440.3	− 2432	8.3	× 3912 / 28146	1.2
4	51,656	2482.2	− 2473	9.2	× 3957 / 28146	1.3
5	51,658	2522.7	− 2502	20.7	× 4016 / 28146	3
6	51,660	2552.8	− 2531	21.8	× 4021 / 28146	3.1
7	51,661	2558.3	− 2552	6.3	× 4103 / 28146	0.9
8	51,663	2577.2	− 2567	10.2	× 3988 / 28146	1.4
11	51,666	2619.5	− 2583	36.5	× 4149 / 28146	5.4
Sum, rounded to a whole point						16

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	53,155	2436.9	− 2432	4.9	× 3780 / 28267	0.7
4	53,156	2487.9	− 2473	14.9	× 3954 / 28267	2.1
5	53,159	2516.9	− 2502	14.9	× 4043 / 28267	2.1
6	53,161	2550.1	− 2531	19.1	× 4107 / 28267	2.8
7	53,163	2564.4	− 2552	12.4	× 4061 / 28267	1.8
8	53,164	2573.2	− 2567	6.2	× 4144 / 28267	0.9
11	53,166	2627.3	− 2583	44.3	× 4178 / 28267	6.5
Sum, rounded to a whole point						17

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	53,244	2447.4	− 2432	15.4	× 3668 / 27912	2
4	53,246	2495.8	− 2473	22.8	× 3878 / 27912	3.2
5	53,248	2530.3	− 2502	28.3	× 3998 / 27912	4.1
6	53,250	2552.4	− 2531	21.4	× 4088 / 27912	3.1
7	53,252	2563.1	− 2552	11.1	× 4053 / 27912	1.6
8	53,254	2573.5	− 2567	6.5	× 4104 / 27912	1
11	53,256	2614.3	− 2583	31.3	× 4123 / 27912	4.6
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	53,476	2444.0	− 2432	12	× 3776 / 27713	1.6
4	53,477	2493.7	− 2473	20.7	× 3716 / 27713	2.8
5	53,478	2527.7	− 2502	25.7	× 3917 / 27713	3.6
6	53,479	2561.1	− 2531	30.1	× 4039 / 27713	4.4
7	53,480	2565.9	− 2552	13.9	× 4089 / 27713	2.1
8	53,481	2572.2	− 2567	5.2	× 4090 / 27713	0.8
11	53,482	2623.2	− 2583	40.2	× 4086 / 27713	5.9
Sum, rounded to a whole point						21

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	53,506	2426.1	− 2432	−5.9	× 3511 / 26436	−0.8
4	53,507	2478.8	− 2473	5.8	× 3568 / 26436	0.8
5	53,508	2514.6	− 2502	12.6	× 3776 / 26436	1.8
6	53,509	2544.5	− 2531	13.5	× 3802 / 26436	1.9
7	53,510	2559.0	− 2552	7	× 3763 / 26436	1
8	53,511	2569.2	− 2567	2.2	× 3991 / 26436	0.3
11	53,512	2605.7	− 2583	22.7	× 4025 / 26436	3.5
Sum, rounded to a whole point						9

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	53,463	2427.0	− 2432	−5	× 3525 / 26313	−0.7
4	53,464	2473.3	− 2473	0.3	× 3591 / 26313	0
5	53,465	2511.1	− 2502	9.1	× 3668 / 26313	1.3
6	53,466	2542.0	− 2531	11	× 3870 / 26313	1.6
7	53,467	2555.2	− 2552	3.2	× 3799 / 26313	0.5
8	53,468	2562.8	− 2567	−4.2	× 3760 / 26313	−0.6
11	53,469	2599.1	− 2583	16.1	× 4100 / 26313	2.5
Sum, rounded to a whole point						5

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	53,319	2423.9	− 2432	−8.1	× 3454 / 26128	−1.1
4	53,320	2474.7	− 2473	1.7	× 3563 / 26128	0.2
5	53,321	2510.0	− 2502	8	× 3638 / 26128	1.1
6	53,322	2546.4	− 2531	15.4	× 3745 / 26128	2.2
7	53,323	2556.4	− 2552	4.4	× 3860 / 26128	0.7
8	53,324	2567.8	− 2567	0.8	× 3839 / 26128	0.1
11	53,325	2608.6	− 2583	25.6	× 4029 / 26128	3.9
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	53,061	2428.4	− 2432	−3.6	× 3321 / 25678	−0.5
4	53,062	2480.7	− 2473	7.7	× 3466 / 25678	1
5	53,063	2520.1	− 2502	18.1	× 3536 / 25678	2.5
6	53,064	2553.8	− 2531	22.8	× 3704 / 25678	3.3
7	53,065	2563.7	− 2552	11.7	× 3705 / 25678	1.7
8	53,066	2572.8	− 2567	5.8	× 3884 / 25678	0.9
11	53,067	2613.1	− 2583	30.1	× 4062 / 25678	4.8
Sum, rounded to a whole point						14

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. 3, 16, 17, 20, 21, 9, 5, 7, 14 → 12.4
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 13 · 2016→2017: 1 · 2017→2018: 3 · 2018→2019: 1 · 2019→2022: 12 · 2022→2023: 4 · 2023→2024: 2 · 2024→2025: 7 → average 5.4
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 5.4 × 2.66 = 14.4. Upper limit 26.8, lower limit −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.