Answer:
82.8
Step-by-step explanation:
i think this is correct dont get mad if im wrong but im 80% sure im right
Answer:
3/5 + 7/10 = 6/10 + 7/10 = 13/10 = 1 and 3/10 lbs. needed
She has 4/5 *3/1 bags = 12/5 = 2 and 2/5 pounds
2 2/5 - 1 3/10 = 2 4/10 - 1 3/10 = 1 and 1/10 pounds left over
Soo. If there are 12 gift baskets and 15 small boxes of chocolate in each box,
15*12 = 180 boxes of chocolate in total.
Since each box has 17 pieces of chocolate, there are 180 * 17 =3060 pieces of chocolate.
31 trust In me I learned this last week
Testing the hypothesis in this problem which is a two-tailed test, we can conclude that there is not sufficient evidence to conclude that the mean time of installation has changed, since the p-value of the test is 0.0364 > 0.01,
At the null hypothesis, we test if the <u>mean is of 25 minutes</u>, that is:

At the alternative hypothesis, we test if the mean has changed, that is, if it is <u>different than 25 minutes</u>.

We have the <u>standard deviation for the sample</u>, thus, the t-distribution is used. The value of the test statistic is:

In which:
- X is the sample mean.
is the value tested at the null hypothesis.- s is the standard deviation of the sample.
- n is the sample size.
In this problem:
- 25 is tested at the null hypothesis, thus
. - Sample mean of 26.2 minutes, thus
. - Sample of 51, thus
. - Variance of 16, thus
.
The <u>value of the test statistic</u> is:



- The p-value of the test is found using a <u>two-tailed test</u>(test if the mean is different of a value), with <u>t = 2.14 and 50 degrees of freedom</u>.
- Using a t-distribution calculator, this p-value is of 0.0364.
Since the p-value of the test is 0.0364 > 0.01, there is not sufficient evidence to conclude that the mean time of installation has changed.
A similar problem is given at brainly.com/question/23777908