Since we are given the mean μ = .80, and standard deviation σ = 5, we compute first the corresponding z scores of x₁ = .70 and x₂ = .80.
The formula for z score is z = (x-μ)/σ.
z₁ = (.70-.80)/5 = -0.02
z₂ = (.80-.80)/5 = 0
Then, using a z table, we find the probability of the corresponding z scores.
For z₁, it is 0.4920 and for z₂ it is 0.5000. (If you notice, x=μ, its probability will always be 0.5000).
We then find the difference between the two probabilities in order to find the percentage of students that earned <span>a score between 70% and 80%
0.5000 - 0.4920 = 0.008 = 0.8%
Only 0.8% of students earned a score between 70% and 80%.</span>
Answer is 6/5. You keep 2/5, change into x, and flip 3/1
I believe x=116 and z=26. 4z-40=64
4z=104
z=26
180-64=116
The function that describes the line that has a y-intercept of -3 and a slope of 2/3 is y = 2/3x - 3. Hope that helps!
according to the graph at x= -2
y = 3