Answer:
a nd c
Step-by-step explanation:
This question is incomplete, the complete question is;
In a survey, 55% of the voters support a particular referendum. If 40 voters are chosen at random,
find the mean and variance for the number of voters who support the referendum.
Answer:
a) The Mean is 22
b) Variance is 9.9
Step-by-step explanation:
Given that;
55% of the voters support a particular referendum p = 0.55
q = 1 - p = 1 - 0.55 = 0.45
sample size n = 40
a)
Mean = sample size n × p
Mean = 40 × 0.55
Mean = 22
Therefore the Mean is 22
b)
Variance = n × p × q
so we substitute
Variance = 40 × 0.55 × 0.45
Variance = 9.9
Therefore the Variance is 9.9
Answer:
5/7
Step-by-step explanation:
B
Answer:
1) p≥2
2) e-9=13
3) f<5
Step-by-step explanation:
1) If there are at least two slices left, there could be more, so use p≥2, meaning p is greater than or equal to 2.
2) e is your starting amount, so put that first, then it says it decreases by 9, so it is e-9=13.
3) If there are fewer than 5, it can not be 5 so you use <.
f<5 or gallons is less than 5.
