Mathematics

Question

The mean midday temperature recorded in June in a city in South California is 36ºC, and the standard deviation is 3ºC. Assuming the data is normally distributed, the number of days in June when the midday temperature was between 39ºC and 42ºC is
a) 3
b) 4
c) 7
d) 12

2 Answer

  • The mean is : 36°.
    The standard deviation ( SD ) is: 3°
    36° + 1 SD = 36° + 3° = 39°
    36 + 2 SD = 36° + 2 * 3° = 36° + 6° = 42°
    Between 39° and 42° is 13.5% days ( and there are 30 days in June ).
    30 * 0.135 = 4.05 ≈ 4
    Answer:
    B ) 4


  • the answer is B im on the test now
NEWS TODAY