Sample standard deviation Jordyn asked 8 people how many apps they each had on their phone. Here are their responses:
21, 28, 31, 46, 55, 60, 65, 70
The mean is © = 47 apps.
Which of these formulas gives the standard deviation?
Choose 1 answer
(21-8)+ (28-8)+ .
47
+ (70 - 8)
S =
(21 - 47)2 + (28 - 47)2 + ... + (70 - 47)?
7
8 =
(21 - 8) + (28 - 8) +...+(70 - 8)
8
11
47

talk back to him about the sport and show him your expertise or leave the room

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

                                              ⇒      

here   k is the proportionality constant whose value is 1.

                                                            [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.