You find a rock containing a mixture of the element and lead. You determine that 5 5% of the original element remains; the other 95 95% decayed into lead. How old is the rock? b. Analysis of another rock shows that it contains 30 30% of its original element; the other 70 70% decayed into lead. How old is the rock? a. The rock is approximately nothing billion years old. (Round to one decimal place as needed.) b. The rock is approximately nothing

Suppose babies born after a gestation period of 32 to 35 weeks have a mean weight of 25002500 grams and a standard deviation of 800800 grams while babies born after a gestation period of 40 weeks have a mean weight of 27002700 grams and a standard deviation of 385385 grams. if a 3232-week gestation period baby weighs 21252125 grams and a 4040-week gestation period baby weighs 23252325 grams, find the corresponding z-scores. which baby weighs lessless relative to the gestation period?