micah surveys a random sample of 20 band members from his school to find out how many minutes they practice…

micah surveys a random sample of 20 band members from his school to find out how many minutes they practice their instruments each day. the results are shown in the dot - plot. based on the data from the sample, about what percent of all band members practice their instruments less than 20 minutes per day? 1% 5% 15% 20% daily instrument practice time (min)

micah surveys a random sample of 20 band members from his school to find out how many minutes they practice their instruments each day. the results are shown in the dot - plot. based on the data from the sample, about what percent of all band members practice their instruments less than 20 minutes per day? 1% 5% 15% 20% daily instrument practice time (min)

Answer

Explanation:

Step1: Count number of band - members practicing less than 20 minutes

Count the dots to the left of 20 on the dot - plot. There are 4 dots.

Step2: Calculate the percentage

Use the formula $\text{Percentage}=\frac{\text{Number of favorable cases}}{\text{Total number of cases}}\times100%$. Here, the total number of band - members in the sample is 20, and the number of band - members practicing less than 20 minutes is 4. So, $\text{Percentage}=\frac{4}{20}\times100% = 20%$.

Answer:

20%