The mean temperature for the first 4 days in January was 7°C. The mean temperature for the first 5 days in January was 9°C. What

Question

Klio2033 [76]

3 years ago

10

The mean temperature for the first 4 days in January was 7°C. The mean temperature for the first 5 days in January was 9°C. What

was the temperature on the 5th day?

Mathematics

2 answers:

attashe74 [19] · Answer 1 · 2022-06-26T08:26:02+03:00

attashe74 [19]3 years ago

6 0

Answer:

11 C

Step-by-step explanation:

To find the mean (average), you have to add all and divide by 2, so if you reverse this, you get (7 + X)/2 = 9 , 9 * 2 - 7 = 11

grin007 [14] · Answer 2 · 2022-06-26T07:04:44+03:00

grin007 [14]3 years ago

4 0

Answer:

If the mean was 7 for the first 4 days that means the sum of temperatures of the first 4 days was 7 * 4 = 28. Similarly, the sum of temperatures of the first 5 days was 9 * 5 = 45 so that means that the temp. on the 5th day was 45 - 28 = 17°C.