Answer:
3² + 6 × 2² - 4² ÷ 2³ = 31.
Step-by-step explanation:
First, we get the z-score using formula:
z =( X - μ ) / σ
From the problem, we substitute the given values:
z = (9 - 7.8) / 1.7
z = 0.71
From the z-table (one-tailed), for a z-score of 0.7059, the proportion of numbers that are greater than 9 is 0.76.
So first calculate root of 3 which is 1.732
Next multiply by 8 to get 13.856
Hope this helps:)
Answer: 25.12
Step-by-step explanation: good luck