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2.7 degrees Fahrenheit
Mean of Sample 1 = (78 + 82 + 85 + 87 + 90 + 85 + 79 + 86 + 91 + 88) / 10 = 85.1
Mean of Sample 2 = (81 + 79 + 80 + 86 + 89 + 92 + 82 + 88 + 84 + 87) / 10 = 84.8
Difference = Mean of Sample 1 - Mean of Sample 2 = 85.1 - 84.8 = 0.3
The mean daily high temperatures of the two samples differ by 0.3 degrees Fahrenheit.