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The following table shows the electricity (in units) used by 25 families of Eklara village in a month of May. Complete the table and answer the following questions.
| Electricity used (units) `bb(x_i)` |
No. of Families (frequency) `bb(f_i)` |
`bb(f_ix_i)` |
| 30 | 7 | _________ |
| 45 | 2 | __________ |
| 60 | 8 | __________ |
| 75 | 5 | __________ |
| 90 | 3 | __________ |
| N = _________ | `sum f_ix_i` = ______ |
- How many families use 45 units electricity?
- State the score, the frequency of which is 5.
- Find N, and `sum f_ix_i`
- Find the mean of electricity used by each family in the month of May.
Concept: undefined >> undefined
Show the following numbers on a number line.
`7/3, 2, (-2)/3`
Concept: undefined >> undefined
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Expand: (x + 2)(x + 3).
Concept: undefined >> undefined
Expand: (2a + 3b)(2a - 3b).
Concept: undefined >> undefined
Expand: `(m + 3/2)(m + 1/2)`.
Concept: undefined >> undefined
Expand: (x - 3)(x - 7).
Concept: undefined >> undefined
Factorise: 2x2 + 5x - 18
Concept: undefined >> undefined
Factorise: x2 - 10x + 21.
Concept: undefined >> undefined
Find the factors of 2y2 - 4y - 30.
Concept: undefined >> undefined
Compare the following number.
−7, −2
Concept: undefined >> undefined
Compare the following number.
`0,(-9)/5`
Concept: undefined >> undefined
Compare the following number.
`8/7, 0`
Concept: undefined >> undefined
Compare the following number.
`(-5)/4, 1/4`
Concept: undefined >> undefined
Compare the following number.
`40/29, 141/29`
Concept: undefined >> undefined
Compare the following number.
`-17/20, (-13)/20`
Concept: undefined >> undefined
Compare the following number.
`15/12, 7/16`
Concept: undefined >> undefined
Compare the following number.
`(-25)/8, (-9)/4`
Concept: undefined >> undefined
Compare the following number.
`12/15, 3/5`
Concept: undefined >> undefined
Compare the following number.
`(-7)/11, (-3)/4`
Concept: undefined >> undefined
