Answer:
The standard deviation of weight for this species of cockroaches is 4.62.
Step-by-step explanation:
Given : A different species of cockroach has weights that are approximately Normally distributed with a mean of 50 grams. After measuring the weights of many of these cockroaches, a lab assistant reports that 14% of the cockroaches weigh more than 55 grams.
To find : What is the approximate standard deviation of weight for this species of cockroaches?
Solution :
We have given,
Mean 
The sample mean x=55
A lab assistant reports that 14% of the cockroaches weigh more than 55 grams.
i.e. P(X>55)=14%=0.14
The total probability needs to sum up to 1,



The z-score value of 0.86 using z-score table is z=1.08.
Applying z-score formula,

Where,
is standard deviation
Substitute the values,





The standard deviation of weight for this species of cockroaches is 4.62.
Y=mx+b
m=slope
b=yint
given
m=2
b=4/5
easy
y=2x+4/5
A
Answer:
The expression x-0.3x represents the total cost of Minecraft Dungeons.
Step-by-step explanation:
Given that:
Percentage of Minecraft sale = 30% off
Cost of Minecraft Dungeons = x
Amount of discount on Minecraft Dungeons = 30% of x
Amount of discount = 
Amount of discount = 0.3x
Total cost of Minecraft Dungeons = Total cost - Discount
Total cost of Minecraft Dungeons = x - 0.3x
Hence,
The expression x-0.3x represents the total cost of Minecraft Dungeons.
Answer:
b is right
Step-by-step explanation:
X/the answer is 264
because 33 times 24 is 792 and divide that by 3 is 264
hope this helps :)