(10 points) Historically, these bolts have an average thickness of 10.1 mm. A recent random sample of 10 bolts yielded these thicknesses: (Data EX0406)9.7 9.9 10.3 10.1 10.59.4 9.9 10.19.710.3(a) Find the sample mean and standard deviation for these data.(b) Assume that the historical average is true. Calculate the observed valueof thet−statistic.(c) What is the probability of these statistics (or worse) if the true meanwere 10.1 mm

answer: 12

step-by-step explanation:

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step-by-step explanation:

answer: 204

step-by-step explanation:

we are told that the revenue is

x⋅(4080−10x)=−10x^2+4080x

this is a quadratic function, so to maximize it we should find the x-value of its vertex. recall that the x-value of the vertex of the parabola ax^2+bx+c is given by the formula −b/2a.

so in this case, we have a=−10 and b=4080, so the x-value of the vertex is

−b/2a= −(4080)/2(−10)=204

step-by-step explanation:

when the line is solid:

when the line is dashed:

this > inequality sign means:

this < inequality sign means:

this > inequality sign means:

this < inequality sign means:

about the problem:

srry i'm not done ! i'll