To find the mean daily high temperature of each sample, we need to add up all the temperatures and then divide by the number of temperatures.
For Sample 1:
Mean = (78 + 82 + 85 + 87 + 90 + 85 + 79 + 86 + 91 + 88) / 10
Mean = 865 / 10
Mean = 86.5°F
For Sample 2:
Mean = (81 + 79 + 80 + 86 + 89 + 92 + 82 + 88 + 84 + 87) / 10
Mean = 848 / 10
Mean = 84.8°F
The mean daily high temperature of Sample 1 is 86.5°F.
The mean daily high temperature of Sample 2 is 84.8°F.
The difference between these mean daily high temperatures is:
86.5 - 84.8 = 1.7°F
Therefore, the mean daily high temperatures of the two samples differ by 1.7°F.