pH Measurement Frequency Table Analysis
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A sample of water was taken from each of ten different locations in a pond. The pH of each sample was measured. The measurements are summarized in the frequency table shown.
| pH | Frequency |
| :---: | :---: |
| 6.8 to 7.0 | 1 |
| 7.1 to 7.3 | 2 |
| 7.4 to 7.6 | 4 |
| 7.7 to 7.9 | 3 |
How many samples have a pH of 7.4 or greater?
A) 3
B) 4
C) 6
D) 7
This question includes visual content: A frequency table with two columns: 'pH' and 'Frequency'. The table has four data rows: 1) pH '6.8 to 7.0' has a frequency of 1. 2) pH '7.1 to 7.3' has a frequency of 2. 3) pH '7.4 to 7.6' has a frequency of 4. 4) pH '7.7 to 7.9' has a frequency of 3.
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Step by Step Written Solution
In this problem, we are looking at a frequency table of pH levels from ten different water samples at a pond. We need to find out how many samples have a pH of seven point four or greater.
Analyzing pH Frequency Table
Let's identify which rows in our table satisfy the condition 'pH of seven point four or greater'.
Identifying relevant rows:
The first row is six point eight to seven point zero, which is less than seven point four. The second row is seven point one to seven point three, also less than our threshold.
| pH | Frequency |
|---|---|
| 6.8 to 7.0 | 1 |
| 7.1 to 7.3 | 2 |
Now look at the third row. It covers the range from seven point four to seven point six. This includes seven point four and values greater than it.
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