Answer:
I can't see clearly
Step-by-step explanation:
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: I'm ok
Step-by-step explanation: thanks tho
80% means 0.80 .
"of" in math almost always means "times".
"80% of 400" means (0.80 x 400). That's 320 .
9514 1404 393
Answer:
276/47
Step-by-step explanation:
The fractions can be given a common denominator by multiplying the top fraction by 6/6. Then the common denominators can be cancelled.