A mixture of pulverized fuel ash and Portland cement to be used for grouting should have an average compressive strength of more than 1300KN=m2. The mixture will not be used unless experimental evidence indicates conclusively that the strength specification has been met. Suppose compressive strength for specimens of this mixture has standard deviation ? = 60. Let ? denote the true average compressive strength.

Check the explanation

Step-by-step explanation:

Hypotheses are:

: μ 1300, : μ > 1300

The distribution of test statistics will be normal with mean

mean 1300

and standard deviation

=20.50277

Now z-score for  T-1331.26 and μ 1300 is

-1300-1.52 1331.26 1300 68/V11

So the probability distribution of the test statistic when H0 is true is

a = P(z > 1.5247) = 0.0643

(2,20) means that the 2 is 2 hours and 20 is 20$. so there both 20$ for 2 hours only the same price. like it says. so, the dunk tank and the bounce house are the same price (20$) for the same amount of time (2 hours).

hope i

(3x-8) or (3x+8)

step-by-step explanation: