Assumed Mean Explorer — StepsLabs Experiment Bay

Control Panel

Assumed mean a 47.5

17.532.547.562.577.592.5

Computing x̄

x̄ = a + (Σf_id_i / Σf_i)
x̄ = + ( / 30) x̄ = 62.00

Pick any a — x̄ always comes out to 62.00. That's the whole point of Activity 1.

Live Calculation Table

Class Interval	f_i	x_i	d_i = x_i − a	f_id_i

This is the exact dataset from the textbook's Table 13.3 — 30 students' marks, grouped into six classes. Slide a across every class mark and watch d_i and f_id_i change completely — but the final mean never budges.