Total marks she'll need to score for an average of 70: 70×5= 350
Score she needs for the 5th test: 350-60-90-90-70=40
She needs to score 40 marks.
Answer:
yes its b
Step-by-step explanation:
In a parallelogram, if two opposites are congruent, then the two opposites are equal. We apply this description to solve the problem.
∠O = ∠M since they are opposite
2x = 3x - 55
55 = 3x - 2x
55 = x
Total of all angles in the parallelogram is 360°
∠L + ∠N +∠O +∠M=360°
360° - ∠O -∠M = ∠L + ∠N note that ∠L =∠N
360° -110° -110° = 2∠N
70° = ∠N
Solving for Y,
∠N = 5Y = 70°
Y=70/5
Y=14
Therefore, the value of "x" is 55 and the value of "y" is 14. The answer is the letter "C".
<u>Answer with explanation:</u>
As per given , we have
A sample of 50 gribbles finds an average length of 3.1 mm with a standard deviation of 0.72.
i.e. n= 50
Degree of freedom = n-1=49
The point estimate of the population mean is equals to the sample mean.
i.e. The best estimate for the length of gribbles= 3.1 mm
Also, population standard deviation is unknown , then the confidence interval would be :
For df= 49 and significance level of 0.05 , the t- value (using t-distribution table) would be :
Now, Margin of error :
95% confidence interval :