Mojave River Academy - Route 66: 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.

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
7	64,286	2408.8	− 2567	−158.2	× 22 / 148	−23.5
8	64,287	2451.2	− 2586	−134.8	× 29 / 148	−26.4
11	64,288	2430.8	− 2628	−197.2	× 97 / 148	−129.2
Sum, rounded to a whole point						−179

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
5	64,357	2318.9	− 2528	−209.1	× 12 / 212	−11.8
6	64,358	2369.3	− 2552	−182.7	× 27 / 212	−23.3
7	64,359	2406.6	− 2567	−160.4	× 51 / 212	−38.6
8	64,360	2425.6	− 2586	−160.4	× 38 / 212	−28.8
11	64,361	2438.5	− 2628	−189.5	× 84 / 212	−75.1
Sum, rounded to a whole point						−178

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	64,341	2329.2	− 2552	−222.8	× 18 / 232	−17.3
7	64,342	2403.0	− 2567	−164	× 42 / 232	−29.7
8	64,343	2397.6	− 2586	−188.4	× 61 / 232	−49.5
11	64,344	2433.4	− 2628	−194.6	× 111 / 232	−93.1
Sum, rounded to a whole point						−190

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	64,312	2288.9	− 2436	−147.1	× 11 / 239	−6.8
5	64,314	2342.9	− 2528	−185.1	× 14 / 239	−10.8
6	64,315	2403.3	− 2552	−148.7	× 18 / 239	−11.2
7	64,316	2384.1	− 2567	−182.9	× 36 / 239	−27.5
8	64,317	2410.6	− 2586	−175.4	× 49 / 239	−36
11	64,318	2419.2	− 2628	−208.8	× 111 / 239	−97
Sum, rounded to a whole point						−189

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
4	64,077	2386.6	− 2485	−98.4	× 14 / 238	−5.8
5	64,078	2331.4	− 2528	−196.6	× 11 / 238	−9.1
6	64,079	2417.4	− 2552	−134.6	× 14 / 238	−7.9
7	64,080	2412.3	− 2567	−154.7	× 44 / 238	−28.6
8	64,081	2386.4	− 2586	−199.6	× 44 / 238	−36.9
11	64,082	2422.7	− 2628	−205.3	× 111 / 238	−95.7
Sum, rounded to a whole point						−184

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −179, −178, −190, −189, −184 → −184
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2019→2022: 1 · 2022→2023: 12 · 2023→2024: 1 · 2024→2025: 5 → average 4.8
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 4.8 × 2.66 = 12.8. Upper limit −171.2, lower limit −196.8.

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 2018–19, 2020–21, 2021–22, 2022–23, 2023–24, 2024–25, 2025–26.