21 times 100 divided by 70 =30
Answer:
we know that mean of the data set is
Sum of all terms / total no. of terms
mean = 120+145+130+80+95+100+340+n / 8
140 = 1010+n / 8
140*8 = 1010 + n
1120 = 1010 + n
1120 - 1010 = n
110 = n
therefore the value of n should be 110
hope it's helpful
Answer:
oxygen-13
Step-by-step explanation:
Consists of 8 protons and electrons and 5 neutrons
188
4x11 + 5 x 28 + 4
44 + 140 + 4
188
