I would really appreciate some help with this.

If data collected shows that 95% of cars travel at a speed less than 140 km h^-1, and 10% travel less than 90 km h^-1. What is the average and the SD for the cars? And what is the proportion of cars that travel at speeds exceeding 110 km^-1?

step-by-step explanation: i dont

idk man good luck man

50x5=$250

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