The histogram show the number of children with age 5 to 8 years old that will attend the summer science activity.
Each bar represents the number of children of a certain age that will attend the science activities.
The frequency bar, shown on the left, indicates the number of children.
In the bottom is indicated the age of the children.
So the first bar indicates the number of 5 years old children that will attend the summer science activities. According to the histogram, 1 child with age 5 years old will attend the activities.
The second bar indicates the number of 6 years old children that will attend the summer science activities. The number of 6 years old children attending is 5
The third bar represents the number of 7 years old children attending. The histogram indicates that there are 6 7years old children attending.
The fourth bar represents the number of 8 years old children attending. There are 2 8years old children attending.
To determine the total number of children you have to add the observed frequencies for each age:
So 5 six years old children will attend the summer science activities and the total of children attending is 14.
You have to determine how many children are "at least" 7 years old.
This means that you have to determine how many children have 7 years or more.
In this sample, there are children that have 7 years old and 8 years old that meet the condition of being "at least" 7 years old. So you have to add the number of kids with ages 7 and 8:
8 children are at least 7 years old