Answer:
a) E(X) = 3.30
b) If these are the only two grades (A and B) available in the school, then this calculated expected value will truly be the expected GPA for each quarter or semester But, if like real life, there are other grades available at the school not included in this calculation, then this value seizes to be the expected value for the GPA over any time period.
Step-by-step explanation:
P(X=xᵢ) = pᵢ
For an A,
P(X=4.0) = 0.3
For a B
P(X=3.0) = 0.7
But E(X) = Σ xᵢpᵢ
E(X) = (0.3 × 4.0) + (0.7 × 3.0) = 3.30
b) If these are the only two grades available in the school, then this calculated expected value will truly be the expected GPA for each quarter or semester But, if like real life, there are other grades available at the school not included in this calculation, then this value seizes to be the expected value for the GPA over any time period.
Answer:
4
Step-by-step explanation:
oim pretty sure because when you mutiply, u are supposed to add the exponents and 3 + 4 = 7; hope this is correct
Answer:
26/50 bc she did it 26 out of 50 times ??
X^2 + 4x - 12
u see that last sign in ur problem....the negative....thats tells us that ur 2 factors will each have different signs. And u see ur first sign...the positive..that tells us that ur larger number will be positive. Now we have to find 2 numbers, then when added = 4 and when multiplied = -12.
6 and -2 are ur numbers...
so when factored, it is : (x + 6)(x - 2) <==
You have to calculate the probability for the given average:
= 3/200 = 0.015 = 1.5%
For 50,000 phones you have to multiply the probability by 50,000:
0.015*50,000 = 750 phone defectives if the company produced 50,000