Question

Pls help I’ll give you 35 points Sina's goal is to exercise a

Answer 1

Answer:

26 minutes

Step-by-step explanation:

Since the mean is the average of all the number, we need to reach a total of 315 minutes for the entire week.

$35+40+37+42+45+50=\\75+40+37+42+45+50=\\115+37+42+45+50=\\152+42+45+50=\\194+45+50=\\239+50=\\289$

Since 315 - 289 = 26, she needs to exercise for 26 minutes on the 7th day in order to reach her goal.

Answer 2

Answer:

26 minutes

Step-by-step explanation:

Let; x be the minutes exercised on the seventh day .

30 + 40 + 37 + 42 + 45 + 50 + x ÷ 6 = 45

244 + x ÷ 6 = 45

Now; the least common multiple is 6

So; multiplying 6 with both sides.

6 * 244 + x ÷ 6 = 45 *6

244 + x = 270

Making x the subject

x = 270 - 244

x = 26

Therefore Sina must exercise for 26 minutes on the seventh day in order to reach her goal exactly.

Note:

Mean is given by adding of numbers given divided by the number of numbers .

Example.

Find the mean of 2,4,3

so;we have 3 numbers

adding numbers = 2 + 4 + 3÷3 = 9÷3 = 3

therefore the mean is 3 .

So; with your question the mean is already given but left with one digit which is the 26 .Hence,you have to represent it by a variable and equate it to the mean given.

with change of subject and further calculation , you will get the result which is the 26 minutes