In A Busy Coffee Shop, Which Is A Member Of An International Chain Of Coffee Shops

We thoroughly check each answer to a question to provide you with the most correct answers. Found a mistake? Tell us about it through the REPORT button at the bottom of the page. Ctrl+F (Cmd+F) will help you a lot when searching through such a large set of questions.

In a busy coffee shop, which is a member of an international chain of coffee shops, 40% of customers order a pastry in addition to their drink. If 20 customers were selected at random during one business day, what is the probability that at least 11 of them did not order a pastry with their drink. Round your answer to 4 decimal places.

  • 0.1275
  • 0.3763
  • 0.5956
  • 0.7553
  • None of the above


Correct answer: 0.7553.

Given that 40% of customers in a busy coffee shop, which is part of a multinational chain of coffee shops, order a pastry along with their beverage, it’s clear that pastries are widely appreciated.

Since each customer is independent and there are only two possibilities for each, the binomial distribution can be used to calculate x the number of customers who did not order a pastry with their cocktail.

X is binomial with n =20 and p = 1-0.4 = 0.60

q = 0.4

The probability that at least 11 of them did not order a pastry with their drink:

Note that binomial prob:

Was this helpful?

Quizzma Team
+ posts

The Quizzma Team is a collective of experienced educators, subject matter experts, and content developers dedicated to providing accurate and high-quality educational resources. With a diverse range of expertise across various subjects, the team collaboratively reviews, creates, and publishes content to aid in learning and self-assessment.
Each piece of content undergoes a rigorous review process to ensure accuracy, relevance, and clarity. The Quizzma Team is committed to fostering a conducive learning environment for individuals and continually strives to provide reliable and valuable educational resources on a wide array of topics. Through collaborative effort and a shared passion for education, the Quizzma Team aims to contribute positively to the broader learning community.