## Is sunlight a mechanical wave?

Waves such as water must transfer energy through a medium; they are called mechanical waves. Waves such as sunlight can transfer energy through empty space and do not need a medium; they are called electromagnetic waves. Ripples are mechanical waves, while rays of sunlight are electromagnetic waves.

## What is the most important example of wave?

Sound is the most important example of a mechanical wave. Sound waves cannot travel through a vacuum.

## What is the class frequency?

Class frequency refers to the number of observations in each class; n represents the total number of observations in the entire data set. For the supermarket example, the total number of observations is 200. The relative frequency may be expressed as a proportion (fraction) of the total or as a percentage of the total.

## How do you find upper and lower limits?

Find the average and standard deviation of the sample. Add three times the standard deviation to the average to get the upper control limit. Subtract three times the standard deviation from the average to get the lower control limit.

## What is the upper limit?

the most extreme possible amount or value. large indefinite amount, large indefinite quantity. an indefinite quantity that is above the average in size or magnitude. the limit on the upper (or northernmost) side of something. type of: demarcation, demarcation line, limit.

## How do you find the upper and lower class limits?

The lower boundary of each class is calculated by subtracting half of the gap value 12=0.5 1 2 = 0.5 from the class lower limit. On the other hand, the upper boundary of each class is calculated by adding half of the gap value 12=0.5 1 2 = 0.5 to the class upper limit.

## What is the formula for class size?

=> Difference between the true upper limit and true lower limit of a class interval is called the Class Size. Class size remains the same for all class intervals.

## How do you find the class boundary?

Use the following steps to calculate the class boundaries:

1. Subtract the upper class limit for the first class from the lower class limit for the second class.
2. Divide the result by two.
3. Subtract the result from the lower class limit and add the result to the the upper class limit for each class.

## What is the upper limit and lower limit?

There are two for each class. The lower class limit of a class is the smallest data value that can go into the class. The upper class limit of a class is the largest data value that can go into the class. Class limits have the same accuracy as the data values; the same number of decimal places as the data values.

## What is the class mark of 100 150?

100+150/2 which is 125……

## What is the class mark of the class 90 120?

So, the lower limit of this class is 90 and the upper limit is 120. Hence, the class mark of the class 90-120 is 105. So, the correct answer is “Option B”.

## What is class mark and class size?

The class mark is the average of the upper and lower limit of a class interval and the class size is the difference of the upper and lower limit of a class interval. Complete step by step answer: Hence, ClassMark=actualupperlimit+actual lowerlimit2 and classsize=actualupperlimit – actuallowerlimit .

110

## What is Class Mark formula?

Class mark = (Upper limit + Lower limit ) / 2. Class size: Class size is defined as the difference between the true upper limit and true lower limit of a class interval.

25

30

## What is class boundary?

Class boundaries are the data values which separate classes. They are not part of the classes or the dataset. The lower class boundary of a class is defined as the average of the lower limit of the class in question and the upper limit of the previous class.

## What is the class boundary of 0 9?

Class boundary is the midpoint of the upper class limit of one class and the lower class limit of the subsequent class. Each class thus has an upper and a lower class boundary….What is Class Boundary?

Class Frequency
0 – 9 2
10 – 19 5
20 – 29 7

## What is the class mark of class interval 50 59?

The class interval (0 – 9) has the lowest frequency. Upper limit is 29.5 and lower limit is 19. The class intervals (10 – 19) and (50 – 59) has the same frequency….Solution:

Class-intervals Actual class interval Frequency
50 – 59 49.5 – 59.5 15