alleryStart learning →The median of the data 3, 5, 7, 9 is:
- 5
- 6
- 7
- 8
Show answer and solution
Correct answer: B. 6
Even count: median = average of 5 and 7 = 6.
Indian Navy INET Statistics — practice questions
Explore 29 free Statistics questions in Indian Navy INET Mathematics. Open each question or exercise to read its content, reference answers and available explanation.
Practise Statistics with Quill →Statistics questions and exercises with answers
Showing questions 1–29 of 29.
The median of the data 3, 5, 7, 9 is:Read the answer and worked solution →The x-coordinate of the point where the less-than and more-than ogives intersect equals the:Read the answer and worked solution →The double angle formula sin 2A equals:Read the answer and worked solution →Sort each inverse function into its domainRead the answer and worked solution →Tap every function whose domain is [−1, 1]Read the answer and worked solution →Match each inverse function to its domainRead the answer and worked solution →Match each inverse function to its principal value branchRead the answer and worked solution →Flip and pair: function with its principal rangeRead the answer and worked solution →Which principal ranges sit around zero, and which run 0 to π?Read the answer and worked solution →Tap every function whose principal range has a point removedRead the answer and worked solution →Name the principal value branchRead the answer and worked solution →Domain checkRead the answer and worked solution →Put the reasoning in order: why an inverse needs a restricted domainRead the answer and worked solution →True or false: existence of inversesRead the answer and worked solution →True or false: reading the tableRead the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →Two are true, one is notRead the answer and worked solution →Assertion and reasonRead the answer and worked solution →Complete the summary tableRead the answer and worked solution →Complete the rule about restricting a domainRead the answer and worked solution →Three of these are wrong. Find the one that holds.Read the answer and worked solution →Principal values worked in the chapterRead the answer and worked solution →Order the steps for finding a principal valueRead the answer and worked solution →True or false: principal valuesRead the answer and worked solution →Match each identity to the condition it needsRead the answer and worked solution →Assertion and reason: identitiesRead the answer and worked solution →Match each mathematician to the year your syllabus givesRead the answer and worked solution →Trace how trigonometry travelledRead the answer and worked solution →True or false: the historical noteRead the answer and worked solution →
Worked practice questions
The x-coordinate of the point where the less-than and more-than ogives intersect equals the:
- mean
- range
- mode
- median
Show answer and solution
Correct answer: D. median
At the intersection, both cumulative counts equal n/2 — by definition, that x-value is the median.
The double angle formula sin 2A equals:
- $\sin A + \cos A$ (incorrect sum)
- $2 \sin A \cos A$ (the correct formula)
- $\sin^2 A - \cos^2 A$ (resembles cos 2A)
- $2 \sin^2 A$ (only partial)
Show answer and solution
Correct answer: B. $2 \sin A \cos A$ (the correct formula)
sin 2A = 2 sin A cos A. Comes from sin(A+A) = sin A cos A + cos A sin A. cos 2A has multiple equivalent forms: cos²A − sin²A = 2cos²A − 1 = 1 − 2sin²A.
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