based on the results, what is the probability of needing exactly 5 rolls to get doubles? 3/20 based on the…

based on the results, what is the probability of needing exactly 5 rolls to get doubles? 3/20 based on the results, what is the probability of needing fewer than 5 rolls to get doubles?

based on the results, what is the probability of needing exactly 5 rolls to get doubles? 3/20 based on the results, what is the probability of needing fewer than 5 rolls to get doubles?

Answer

Explanation:

Step1: Count total number of data - points

Count all the dots in the dot - plot. There are 20 dots in total.

Step2: Calculate probability of needing fewer than 5 rolls

Count the number of dots for 1, 2, 3, and 4 rolls. There are 4 + 5+ 4+ 3 = 16 dots for 1 - 4 rolls. The probability $P(X\lt5)$ is the number of favorable outcomes (fewer than 5 rolls) divided by the total number of outcomes. So $P(X\lt5)=\frac{16}{20}=\frac{4}{5}$.

Answer:

$\frac{4}{5}$