A sample of size n taken from a population with mean = µ and standard deviation = σ has sample mean = µ and sample s.d. = σ/√n.
If the final exam scores are normally distributed, and X is a random variable for the mean of a sample, then
Pr[X < 70] = Pr[(X - 73) / (7.8/√24) < (70 - 73) / (7.8/√24)]
… ≈ Pr[Z < -1.8842]
… ≈ 0.0298
(where Z is normally distributed with µ = 0 and σ = 1).
Answer:
Step-by-step explanation:
Known facts
- Marisol burned 670 calories
- Ling burned x fewer calories than Marisol
Setting up the equation
# of calories that Ling burned = Marisol's calorie - x = 670 -x
Hope that helps!
Answer:
Frequency table
2,4,5,5,5,6,7,8,9,9,10,11,12,15
First step is square root both sides leaving with
x-6=+/-3
closest one is A
answer is A
Approximately 2 people will not turn up to the flight.
I figured it out by finding 1% (1.16)
multiplying it by 2 (2.32)
halving 1.16 to find 0.5% (0.58)
And then adding 0.58 to 2.32 to find 2.5% (1.9256)
Round that up to 2 as you cannot have 0.9256 of a person.
Therefore 118 people will arrive for the flight.
Hope I helped