The mean temperature for the first 4 days in january was -2°c. the mean temperature for the first 5 days in january was -3°c. what was the temperature on the 5th day?

We are told that the mean temperature for the first 4 days in January was -2°C. The mean temperature for the first 5 days in January was -3°C.

Now we will find sum of temperatures on first four days of January by multiplying 4 by -2.  

Now let us find sum of temperature on first 5 days of January.

Now we will subtract -8 from -15 to find temperature on the 5th day of January.

Therefore, temperature on the 5th day of January was

hello,

b) 62.47% of the students are between 14 and 18 years old.

step-by-step explanation:

mean = 15 and standard deviation = 2

student between 14 to 18

formula used z-score

for age 14 , z score

using z-table , p(z> -0.5)=0.3085

for age 18 , z score

using z-table , p(z< 1.5)=0.9332

p(-0.5< z< 1.5)=0.9332-0.3085 = 0.6247

thus, 62.47% of the students are between 14 and 18 years old.

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step-by-step explanation: