Answer: 0.24
Step-by-step explanation:
The probability of randomly selecting a blue card = 20% = 0.2
The probability of randomly selecting a red card = 30% = 0.3
The probability of not randomly selecting a blue card = 1 - 0.2 = 0.8
The probability of not randomly selecting a red card = 1 - 0.3 = 0.7
Therefore, the probability that Stella will randomly select a card that is not blue, replace it, then randomly select a card that is red will be:
= P(not blue ) × P(red)
= 0.8 × 0.3
= 0.24
The answer is 0.24
Answer:
3
Step-by-step explanation:
3 times 3 is 9 plus 12 is 21....3 times 7 is 21.
Answer:
The critical value is T = 1.895.
The 90% confidence interval for the mean repair cost for the washers is between $48.159 and $72.761
Step-by-step explanation:
We have the standard deviation for the sample, so we use the t-distribution.
The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So
df = 8 - 1 = 6
90% confidence interval
Now, we have to find a value of T, which is found looking at the t table, with 6 degrees of freedom(y-axis) and a confidence level of
. So we have T = 1.895, which is the critical value.
The margin of error is:

In which s is the standard deviation of the sample and n is the size of the sample.
The lower end of the interval is the sample mean subtracted by M. So it is 60.46 - 12.301 = $48.159
The upper end of the interval is the sample mean added to M. So it is 60.46 + 12.301 = $72.761
The 90% confidence interval for the mean repair cost for the washers is between $48.159 and $72.761
Answer:
n(B) = 1350
Step-by-step explanation:
Using Venn sets, we have that:

Three values are given in the exercise.
The other is n(B), which we have to find. So




So
n(B) = 1350
Answer:
Lol its 420
Step-by-step explanation: