Why might this group of toys not be a valid sample? Check all that apply.

B and D

Step-by-step explanation:

A sample is a small representative of a quantity intended to show a characteristic of the whole population.

In this case, the manager wants to find out the number of defective toys produced by his company each year. The best sample should be for all toys produced per day not the first 100 toys because chances are that in the 100 toys none will be a defective yet there is still more produced for the rest of the day. The sample taken is only for the first 100 toys produced per day.A similar case is true for option D, where a valid sample should be for the whole week or month not just a day.

B and D

Step-by-step explanation:

A sample is a small representative of a quantity intended to show a characteristic of the whole population.

In this case, the manager wants to find out the number of defective toys produced by his company each year. The best sample should be for all toys produced per day not the first 100 toys because chances are that in the 100 toys none will be a defective yet there is still more produced for the rest of the day. The sample taken is only for the first 100 toys produced per day.A similar case is true for option D, where a valid sample should be for the whole week or month not just a day.

The sample should represent all the toys produced throughout the day, not just the first and The sample should represent an entire week or month, not just a single day

Step-by-step explanation:

Cost of 7 gallons=$24.50

Cost of 1 gallon=24.50/7=3.5

Cost of 15 gallons=15*3.5=52.5

Cost of 15 gallons will be $52.5

The answer is in the image 

y=2x+15

where y=Value of coin

x=Age in years

Value of coin after 19 years=2*19+15

=$53

Therefore, Value after 19 years=$53

The answer is in the image 

Speed=Distance/time

Here,

distance=15m

time=1sec

speed=15/1=15m/sec

Distance=Speed*time

time=15min=15*60sec=900sec

Distance travelled in 15 min=15*900=13,500m

=13500/1000 km=13.5Km

The wood before starting =12 feet

Left wood=6 feet

Wood used till now=12-6=6 feet

Picture frame built till now= 6/(3/4)

=8 pieces

Therefore, till now 8 pieces have been made.

tip=18% of 75.45

     =18/100 * 75.45 = $13.581

Tip = $13.581