Mojave Jr./Sr. High: 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.

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	16,952	2374.7	− 2552	−177.3	× 48 / 198	−43
7	16,954	2406.3	− 2567	−160.7	× 64 / 198	−51.9
8	16,956	2427.4	− 2586	−158.6	× 49 / 198	−39.2
11	16,958	2446.9	− 2628	−181.1	× 37 / 198	−33.8
Sum, rounded to a whole point						−168

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	17,103	2439.5	− 2552	−112.5	× 47 / 181	−29.2
7	17,104	2408.5	− 2567	−158.5	× 40 / 181	−35
8	17,105	2419.3	− 2586	−166.7	× 60 / 181	−55.3
11	17,106	2443.8	− 2628	−184.2	× 34 / 181	−34.6
Sum, rounded to a whole point						−154

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	17,147	2372.8	− 2552	−179.2	× 55 / 239	−41.2
7	17,148	2429.8	− 2567	−137.2	× 66 / 239	−37.9
8	17,149	2417.7	− 2586	−168.3	× 64 / 239	−45.1
11	17,150	2428.6	− 2628	−199.4	× 54 / 239	−45.1
Sum, rounded to a whole point						−169

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	17,085	2363.3	− 2552	−188.7	× 60 / 192	−59
7	17,086	2432.4	− 2567	−134.6	× 46 / 192	−32.2
8	17,087	2419.8	− 2586	−166.2	× 61 / 192	−52.8
11	17,088	2427.4	− 2628	−200.6	× 25 / 192	−26.1
Sum, rounded to a whole point						−170

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	17,042	2382.8	− 2552	−169.2	× 57 / 205	−47
7	17,043	2399.8	− 2567	−167.2	× 58 / 205	−47.3
8	17,044	2406.6	− 2586	−179.4	× 46 / 205	−40.3
11	17,045	2444.6	− 2628	−183.4	× 44 / 205	−39.4
Sum, rounded to a whole point						−174

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	17,025	2364.5	− 2552	−187.5	× 50 / 204	−46
7	17,026	2390.3	− 2567	−176.7	× 56 / 204	−48.5
8	17,027	2383.3	− 2586	−202.7	× 53 / 204	−52.7
11	17,028	2459.6	− 2628	−168.4	× 45 / 204	−37.1
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. −168, −154, −169, −170, −174, −184 → −169.8
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2018→2019: 14 · 2019→2022: 15 · 2022→2023: 1 · 2023→2024: 4 · 2024→2025: 10 → average 8.8
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 8.8 × 2.66 = 23.4. Upper limit −146.4, lower limit −193.2.

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. From 2017–18, 2018–19, 2020–21, 2021–22, 2022–23, 2023–24, 2024–25, 2025–26.