Answer:
A) 2cm
Step-by-step explanation:
According to the Triangle Inequality Theorem, the sum of the measure of any two sides of a triangle MUST be larger than the measure of the third side. In this case, with sides 3cm and 5cm, the third side would have to be at least 3cm in order for the smallest two sides to be larger than the third side:
3cm + 3cm = 6 cm > 5cm
However, if the third side was only 2cm, then the two smaller sides would be 5cm, which is only equal to and not larger than the third side:
3cm + 2cm = 5cm
Any other measurements larger than 3cm, when added to the given side of 3cm, would be larger than 5cm and would form a triangle. So, the only measure that would NOT form a triangle would be 2cm.
Using the empirical rule, the probability that a randomly selected student's math score is between 300 and 700 (both 2 standard deviations below the mean) is 95%. Or in decimal form, .95.
I think the mean, sorry not sure, hope this helps!
Answer:
E(M) = 23/3
Var(M) = 53/9.
Step-by-step explanation:
There are three possible values for M: 4, 6, and 10.
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That's six unique combinations in total. If the balls are drawn randomly, the probability for getting each combination shall be equal. That is:
.
Consider the formula for the expected value of a discrete random variable:
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Formula for the variance of a discrete random variable (note that this formula can take many other forms):
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