Before adding dissimilar fractions (fractions with different denominator), you have to make the fractions similar first. To make the fractions similar, find the Least Common Multiple of the denominator. In this case, the LCM is 10. Then rewrite the fractions using the LCM as the denominator.
9/10 = 9/10; 4/5 = 8/10
You can now proceed with addition -
9/10 + 8/10 = 17/10 or 1 7/10
Answer:29.3
Step-by-step explanation: 88/3
A is false but R is true (the mean of the last 3 values is not 8 since x=7)
Answer: c) There is not enough evidence to reject H0
Step-by-step explanation: