Answer: 7 9/20
Step-by-step explanation:
Add the two fractions together and In decimal form you will get 12.55. Simplify into fraction form and you get 7 9/20
Options:
H0 :
H0 : µ =12
H0 > 12> H1
None of these
Answer:
None of these
Step-by-step explanation:
The answer is
H0 : µ ≧ 12
Ha : µ<12
We formulate the null and alternative hypothesis here to state that battery life of the laptop lasts at least 12 hours(more than but not less, null hypothesis) or that it lasts less than 12 hours(alternative hypothesis).
The null hypothesis is the one being tested to know whether we would reject it or not in which case we choose the alternative hypothesis. To test the hypotheses, we do a t test using a significance level of say 0.05(95% confidence interval) and find our p value in order to compare and decide if the null hypothesis would be rejected or not based on statistical significance.
Answer:
Car B = 43 miles per gallon
Car A = 43+4=47 miles per gallons
Step-by-step explanation:
Let the mileage of Car B be x miles per gallon
Hence the mileage of Car A will be x+4 miles per gallon
Distance traveled by each car in 1 gallon
Car A = x+4
Car B = x
Total Distance covered by both car in 1 gallon = x+(x+4) which is given as 90 miles
Hence x+(x+4)=90
2x+4=90
2x=86
dividing both sides by 2 we get
x=43
Mileage of Car B = 43 miles per gallon
Mileage of Car A = 43+4=47 miles per gallons
They will be able to make 42 and a half