Answer: they’re both 53
Step-by-step explanation:
i just took the test and it is correct
Answer:
The result will be smaller than 2.6s, 16% of the time.
Step-by-step explanation:
This is a normal distribution problem
The standardized score for any value is the value minus the mean then divided by the standard deviation.
z = (x - xbar)/σ
x = the random value = 2.6 s
xbar = mean = the average = 3.4 s
σ = standard deviation = 0.8 s
z = (2.6 - 3.4)/0.8 = - 1
P(x < 2.6) = P(z < - 1) = 1 - P(z ≥ - 1) = 1 - P(z ≤ 1) = 1 - 0.841 = 0.159 = 16%
In American: I have to buy pencils and pens. If I buy seven pencils and three pens, I'll spend $ 16.50. If I buy five pencils and four pens, I'll spend $ 15.50. What is the price of each pencil and pen?
Idk the answer
