2xa(-4xb - 2x 3 + 5x)
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Mumbi is approximately 845 kilometers away from Bangalore, and Mumbai is approximately 1160 km away from Delhi, then the ratio between these distances is
A. Bangalore to Mumbai: 116.5 cm;
Mumbai to Delhi: 174 cm
The ratio:
This option is false.
B. Bangalore to Mumbai: 42.25
Mumbai to Delhi: 58 cm
The ratio is
This option is true.
C. Bangalore to Mumbai: 23.4 cm
Mumbai to Delhi: 29 cm
The ratio is
This option is false.
D. Bangalore to Mumbai: 16.9 cm
Mumbai to Delhi: 23.2 cm
The ratio is
This option is true.
E. Bangalore to Mumbai: 25.35 cm
Mumbai to Delhi: 34.8cm
The ratio is
This option is true.
Answer: correct options are B, D and E
Answer and Step-by-step explanation:
A) For the model to be a probability distribution, it has to follow two conditions:
1) The probability of each value of the discrete random variable is between, and included, 0 and 1:
2) The sum of all probabilities is 1;
In the table shown, the probabilities are from 0 to 0.3 - between 0 and 1;
Adding the probabilities: 0 + 0.3 + 0.1 + 0.3 + 0.3 = 1
Therefore, this model is a valid probability distribution model.
B) They are discrete because each value correspond to a finite number of possible values.
C) Expected value is calculated by
E(X) = 2.6
D) P(X=3) = P(3), which means probability of 3:
P(X=3) = 0.3
E) P(X<4): probabilities of values of X that are less than 4:
P(X<4) = P(0) + P(1) + P(2) + P(3)
P(X<4) = 0 + 0.3 + 0.1 + 0.3
P(X<4) = 0.7
F) P(X>0) = P(1) + P(2) + P(3) + P(4)
P(X>0) = 0.3 + 0.1 + 0.3 + 0.3
P(X>0) = 1
G) P(X=5) = P(5)
There is no probability of P(5) because the model doesn't "cover" that number.
H) P(X=0) = P(0)
P(X=0) = 0
I) The total area of any density curve is 1 because it represents all the possible values a variable can assume.