Assignment_12.05.2017

                                         ASSIGNMENT_12.05.2017

Do the following questions from textbook on assignment notebook
*Do the questions serial wise as mentioned below.

Q1--(Ex 1.1 Q1 ii part)
Q2-- (Ex 1.1 Q 4)
Q3-- ( Ex 1.2 Q3 ii part)
Q4-- (Ex 1.2 Q7)
Q5--( Ex 1.3 Q1)
Q6--( Ex 1.3 Q3 iii part)
Q7--(Ex 2.3 Q3)
Q8-- ( Ex 14.3 Q1)
Q9--( Ex 15.1 Q14)
Q10--(Ex 15.1 Q18)
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PRACTICE QUESTIONS(STATISTICS)_09.05.2017

Class X                          Practice Question (Statistics)

Q1.Find the mean of the following data ( By direct method) :  Ans-25.2

Class interval	0-10	10-20	20-30	30-40	40-50
Frequency	8	12	10	11	9

Q2. The arithmetic mean of the following frequency distribution is 25. Determine the value of p.  Ans – p=16

Class	0-10	10-20	20-30	30-40	40-50
Frequency	5	18	15	p	6

Q3.If the mean of the following frequency distribution is 65.6 , find the missing frequency f1 and f2 . (Ans – 12,3)

Class	10-30	30-50	50-70	70-90	90-110	110-130	Total
frequency	5	8	F1	20	F2	2	50

Q4.Data regarding the weights of students of class X of a school is given below : (Ans – 57.24 kg)

Weight ( in kg)	50-52	52-54	54-56	56-58	58-60	60-62	62-64
Number of students	18	21	17	28	16	35	15

Compute the mean weight of the students. ( By assumed mean method)

Q5.Calculate the arithmetic mean of the following frequency distribution using the step –deviation method : (Ans-148.61)

Class interval	Frequency
0-50	17
50-100	35
100-150	43
150-200	40
200-250	21
250-300	24

Q6.Compute the arithmetic mean for the following data . (Ans- 28.6)

Marks obtained	Frequency
Less than 10	14
Less than 20	22
Less than 30	37
Less than 40	58
Less than 50	67
Less than 60	75

Q7.Find the arithmetic mean of the following frequency distribution; (Ans- 36.36)

Class	25-29	30-34	35-39	40-44	45-49	50-54	55-59
Frequency	14	22	16	6	5	3	4

Q8.Find the median wage from the following data:  (Ans- Rs .868)

Wages (In Rs)	800-820	820-840	840-860	860-880	880-900	900-920	920-940
Number of workers	7	14	19	25	20	10	5

Q9.Find the missing frequencies in the following frequency distribution table ,if N=100 and median is 32. (Ans 9,16)

Marks	0-10	10-20	20-30	30-40	40-50	50-60	Total
Number of students	10	?	25	30	?	10	100

Q10.Compare the modal ages of two groups of students appearing for an entrance examination : (Ans-18.93,18.83)

Age ( in years)	16-18	18-20	20-22	22-24	24-26
Group A	50	78	46	28	23
Group B	54	89	40	25	17

Q11.The following table gives production yield per hectare of wheat of 100 farms of a village.

Production yield ( kg/ha)	40-45	45-50	50-55	55-60	60-65	65-70
No of farms	4	6	16	20	30	24

Change the distribution to a ‘more than’ type distribution and drive its ogive.

Q12.The table given below shows the frequency distribution of the scores obtained by 200 candidates in a CET examination. (Ans- 3756)

Score	200-250	250-300	300-350	350-400	400-450	450-500	500-550	550-600
No of candidates	30	15	45	20	25	40	10	15

  Draw cumulative frequency curves by using (i) ‘less than’ series and (ii) ‘More than’ series.   Hence find the median

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