Consider the accompanying data on flexural strength (mpa) for concrete beams of a certain type.

11.8 7.7 6.5 6.8 9.7 6.8 7.3

7.9 9.7 8.7 8.1 8.5 6.3 7.0

7.3 7.4 5.3 9.0 8.1 11.3 6.3

7.2 7.7 7.8 11.6 10.7 7.0

a) calculate a point estimate of the mean value of strength for the conceptual population of all beams manufactured in this fashion. [hint: ? xi = 219.5.] (round your answer to three decimal places.)

mpa

state which estimator you used.

x

p?

s / x

s

x tilde

answer: 4 (:

step-by-step explanation:

the revenue of the fitness center, y, is the product of two factors: the number of members and the fee paid by each member. there are 320 members now, but number of members goes down by 10 for each $5 increase in fees, so if x is the number of $5 price increases then members is equal to (320 - 10x). since the fee is currently $45, and the fee increases by $5 for every price bump x, the fee is given by (45 + 5x). so, revenue y is given by y = (320 - 10x)(45 + 5x).