Of great importance to residents of a certain region is the amount of radioactive material present in the soil of reclaimed phosphate mining areas. Measurements of the amount of 238U in 25 soil samples were as follows (measurements in picocuries per gram). 74 6.47 1.90 2.69 .75
.32 9.99 1.77 2.41 1.96
1.66 .70 2.42 .54 3.36
3.59 .37 1.09 8.32 4.06
4.55 .76 2.03 5.70 12.48
Construct a relative frequency histogram for these data.

What is the inverse of f(x) = 6x -24

Do one of the following, as appropriate: (a) find the critical value z subscript alpha divided by 2 , (b) find the critical value t subscript alpha divided by 2 . 99%; nequals 17; sigma is unknown; population appears to be normally distributed.

Ahigh-altitude spherical weather balloon expands as it rises, due to the drop in atmospheric pressure. suppose that the radius r increases at the rate of 0.02 inches per second, and that r = 36 inches at time t = 0. determine the equation that models the volume v of the balloon at time t, and find the volume when t = 360 seconds. v(t) = 4π(0.02t)2; 651.44 in3 v(t) = 4π(36 + 0.02t)2; 1,694,397.14 in3 v(t) = four pi times the product of zero point zero two and t to the third power divided by three.; 4,690.37 in3 v(t) = four pi times the quantity of thirty six plus zero point zero two t to the third power divided by three.; 337,706.83 in3