The marks obtained by a student in different subjects in an exam are given below- begin array - c - c - Whine Subject - Marks Whline English - 77 INhline Hindi - 90 Whhine Maths - 70 Wlhline Physics - 86 llilhline Chemistry - 85 Whhine Biology - 97 -Ihline Computer Sci- - 59 lillaline History - 62 INhline Geography - 100 llhline Moral Sci- - 75 -llhline lendarrayFind the probability that in an exam- she will scorei 100ii 80 or moreiii less than 60- -4 MARKS-

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Standard VII

Mathematics

Experimental/ Empirical Probability

The marks obt...

Question

The marks obtained by a student in different subjects in an exam are given below.

$\begin{matrix} S u b j e c t & M a r k s E n g l i s h & 77 H i n d i & 90 M a t h s & 70 P h y s i c s & 86 C h e m i s t r y & 85 B i o l o g y & 97 C o m p u t e r S c i . & 59 H i s t o r y & 62 G e o g r a p h y & 100 M o r a l S c i . & 75 \end{matrix}$

Find the probability that in an exam, she will score
(i)100
(ii)80 or more
(iii) less than 60. [4 MARKS]

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Solution

Concept:1Mark
Solution:1Mark each

Total number of exams = 10.
Number of exams in which the student scored a hundred = 1.
Probability of scoring hundred = $\frac{1}{10}$ = 0.1.
Number of exams in which she scored 80 or more = 5.
Probability of scoring 80 or more = $\frac{5}{10}$ = 0.5.
Number of exams in which she scored less than 60 = 1.
Probability of scoring less than 60 = $\frac{1}{10}$ =0.1.

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The marks obtained by a student in different subjects in an exam are given below.

$\begin{matrix} Subject & Marks English & 77 Hindi & 90 Maths & 70 Physics & 86 Chemistry & 85 Biology & 97 Computer Sci. & 59 History & 62 Geography & 100 Moral Sci. & 75 \end{matrix}$

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The marks obtained by a student in different subjects in an exam are given below. SubjectMarksEnglish77Hindi90Maths70Physics86Chemistry85Biology97Computer Sci.59History62Geography100MoralSci.75 Find the probability that in an exam, she will score (i)100 (ii)80 or more (iii) less than 60. [4 MARKS]