(b) A company will introduce a new product if at least 6 X 100% of its customers purchase the product, do has been determined. Let 0 be the probability that a customer would buy the product. One needs to estimate 0, then compare it with 60. Suppose that n customers x = (X1, ...,In) are surveyed, with r; = 1 meaning "Yes", and r; = 0 meaning "No". Statistically, we say that each r; has a Bernoulli distribution B(1, 0) with density p(x:|0) = 07(1 - 0)1-21 Write down the likelihood function based on sample x. What is MLE of 0