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New on YouTube: This HRT Quant Interview Question Has a One-Line Answer - Watch now

Get quant-ready in 2026

⚡ Build the skills to land top-paying quant jobs. Offer ends in 25d 09h 51m 58s25 days 9 hours 51 minutes 58 seconds.

A fair coin is tossed 400 times. Using the Central Limit Theorem (normal approximation to the binomial) without continuity correction, estimate the probability that at least 230 heads are observed. Give the answer as a decimal rounded to 5 digits after the decimal point.