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charle [14.2K]
3 years ago
13

The population of scores on the SAT forms a normal distribution with μ =500 and σ = 100. If you take a random sample of n =100 w

hat is the probability that the sample mean will be greater than M = 520
Mathematics
1 answer:
Hitman42 [59]3 years ago
5 0
P(M > 520) = 1 - P(M < 520) = 1 - P(z < (520 - 500)/(100/sqrt(100))) = 1 - P(z < (20/(100/10))) = 1 - P(z < 20/10) = 1 - P(z < 2) = 1 - 0.97725 = 0.02275
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Select the statement that is true about squares from the choices below.
Leya [2.2K]
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What would be the first step to solve for n in the equation 3n-7=30?
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4 0
2 years ago
Read 2 more answers
Absolute value of +4 and -2
Greeley [361]

Answer:

4 and 2

Step-by-step explanation:

3 0
3 years ago
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Jan and Wayne went to the store to buy some groceries. Jan bought 2 cans of corn beef hash and 3 cans of creamed chipped beef fo
olasank [31]
You can solve this by using the system of equations.
Jan - 4.95 = 2H + 3C
Wayne - 5.45 = 3H + 2C

Use elimination.
-3(2H + 3C = 4.95)
2(3H + 2C = 5.45)

Solve. And you'll get:
-6H + (-9C) = -14.85
6H + 4C = 10.9

Cross out -6H and 6H because they cancel out. And you're left with:
-9C = -14.85
4C = 10.9

Add -9C with 4C, and -14.85 with 10.9.
-5C = -3.95

Divide each side with -5.
C = $0.79

Now to figure out what H is, just substitute the C in one of the equations with 0.79.
5.45 = 3H + 2(0.79)
5.45 = 3H + 1.58
-1.58            -1.58
3.87 = 3H
3.87/3 = 3/3(H)
1.29 = H

Finished!
7 0
3 years ago
Read 2 more answers
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