The temperature at 90% humidity is 76 based on the trend line
How to predict the temperature at 90% humidity
From the question, we have the following parameters that can be used in our computation:
y = 2/15x + 64
Also, we have
humidity = 90%
This means that
x = 90
Substitute the known values into the equation
y = 2/15 * 90 + 64
Evaluate
y = 76
Hence, the temperature at 90% humidity is 76