Whisper-20dB
Quiet Residence-30dB
Soft stereo in Residence-40dB
Average Speech-60dB
Cafeteria-80dB
Pneumatic Jackhammer-90dB
Loud crowd noise-100dB
Accelerating Bike-100dB
Rock concert-120dB
Jet Engine (75 ft away)-140dB
(1)Mode=100dB (since 100 is occurring the maximum no. of times, i.e. it has the highest frequency of 2)
(2)Mean=sum of observations/Total number of observations
=(20+30+40+60+80+90+100+100+120+140)/10
=770/10=10dB
(3)Median= 1/2[{n/2}th observation + {(n/2)+1}th observation], where, n=total no. of observations
So, 1/2[{10/2}th observation + {(10/2)+1}th observation]
=1/2[5th observation+6th observation]
=1/2[80+90] [Because:5th observation=80dB and 6th=90dB]
=1/2(170)
=85
Therefore, median=85dB
A-2=10
A-2+2=10+2
A=12
if a number subtracted by 2 equals 10, then what is that number? you can use the number family method, and do 10+2, which equals 12.
Answer:
5
Step-by-step explanation:
If you want to do this with multiplication,
then 5% of 100 is 0.05 x 100 = 5
or you can think of 10% of 100 is 10, and then half it, it is 5
I think it's false.... 5/6 is 83.33% as a percent so I don't think it's true.