Answer:
P(X < 4) = 0.5
Step-by-step explanation:
For each question, there are only two possible outcomes. Either it is answered correctly, or it is not. The probability of a question being answered correctly is independent of any other question. This means that we use the binomial probability distribution to solve this question.
Binomial probability distribution
The binomial probability is the probability of exactly x successes on n repeated trials, and X can only have two outcomes.
In which 
is the number of different combinations of x objects from a set of n elements, given by the following formula.
And p is the probability of X happening.
In this question, we have that:
Find the probability that the number of correct answers is fewer than 4:
This is
So
P(X < 4) = 0.5
Answer:
Just put this in your calculator I've shown you how to do the conversion
Answer:
x=20
Step-by-step explanation:
5(x+9) =145 (watch carefully)
5x + 45 = 145
5x + 45 - 45 = 145 - 45
5x = 100
5x/5 (to cancel eachother out) then --> 100/5
x=20
Answer:
f(a)=2a+4
Step-by-step explanation:
1. multiply 2×a, which equals to 2a
2. then multiply 2×3, which equals to 6
3. then you'll get f(a)=2a+6-2
4. subtract 6 and 2
5. once that is done your answer will be f(a)=2a+4
Answer:
22-5f
Step-by-step explanation:
22 less than 5 would be 22-5 and then 5 times a number f would be 5f so you would just put it all together and you would get 22-5f. I hope this is helpful
