data.js

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function getAvg(grades) {
    const total = grades.reduce((acc, c) => acc + c, 0);
    return total / grades.length;
}

let firstX = null
const ticks = 148
const tickDict = {}

for (const line of data) {
    const x = Math.floor(line[0]);
    if (!firstX) {
        firstX = x;
    }
    const y = line[1];

    if (x - firstX < 148) {
        tickDict[x] = [...(tickDict[x] || []), y];
    }
}
const result = []
for (const x in tickDict) {
    if (Object.hasOwnProperty.call(tickDict, x)) {
        const ys = tickDict[x];
        const y = getAvg(ys);
        result.push(Math.floor(y))
    }
}

console.log(tickDict);
console.log(JSON.stringify(result));