Two percent of mobile phones produced at a factory are defective. which of the following is a binomial experiment?
selecting phones randomly until a non-defective phone is chosen
selecting phones randomly until 200 defective phones are chosen
selecting 200 phones randomly and recording whether each phone is defective
selecting a group of phones randomly and recording the number of defective phones in the group

Selecting 200 phones randomly and recording whether each phone is defective.

Step-by-step explanation:

The binomial experiment is defined as an experiment that contains 'n' repeated trials.

Each trial has only two outcomes. Either positive or negative. Or either yes or no. The yes is success and no is failure. The probability of success is same in each trial.

Therefore, as per the explanation, we can say that correct answer is - Selecting 200 phones randomly and recording whether each phone is defective.

Here 200 trials will take place with the probability of either a yes or no in each trial.

x= -3 and

step-by-step explanation:

to find the roots of a cubic, use division or factoring to find the factors then set equal to 0. as this is a difference of cubes, it factors into

where a is the cube root of .

here   this is 27 and the cube root of 27 is 3. so we write using the form:

.

set each factor to 0 and solve for x.

x-3=0

x=3

the quadratic expression does not factor and must be solved using the quadratic formula.

where a = 1, b=3, and c=9

this cubic has two complex roots.

0.02

step-by-step explanation:

time of 9 192 631 770 periods of the radiation corresponding to the transition between the 2 hyperfine levels of the ground state of the caesium 133 atom at 0 k (but other seconds are sometimes used in astronomy)