Answer:
The expected number of defective batteries to be pulled out is 0.9, which rounded to the nearest integer gives a total of 1, that is, 1 of the 3 batteries is expected to be defective.
Step-by-step explanation:
Given that a box contains 3 defective batteries and 7 good ones, and I reach in and pull out three batteries, to determine what is the expected number of defective batteries, the following calculation must be performed:
3 + 7 = 100
3 = X
10 = 100
3 = X
3 x 100/10 = X
300/10 = X
30 = X
3 x 3/10 = X
0.9 = X
Therefore, the expected number of defective batteries to be pulled out is 0.9, which rounded to the nearest integer gives a total of 1, that is, 1 of the 3 batteries is expected to be defective.
Answer:
164 is not a perfect square
Step-by-step explanation:
Because if you calculate its square root, 164 doesn't have a whole number as its square root and a perfect square needs the square root to be a whole number.
40 x 0.45 = 18 students are boys
Answer:
1.6* 10^5
Step-by-step explanation:
1. Move the decimal place to the left to make a number from 1 to 10.
2. Find the exponent, that is the number of times you moved the decimal.
3.Then put the number in scientific notation.
The answer is 0.13 because it has the highest number in the tens place.