just some quick scratchpad calculations

lab7.js

const times = [0.01127,0.01199,0.01197,0.00957,0.01198,0.01104,0.01098,0.01202,0.01159,0.01206]
const velocity = times.map(t => 1.536*2/t);

const meanVelocity = velocity.reduce((a,b) => a+b, 0) / 10;

const stdDev = Math.sqrt(velocity.map(v => (v - meanVelocity)**2 / 10).reduce((a,b) => a+b, 0));
const stdErr = stdDev / Math.sqrt(10);