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Sidana [21]
3 years ago
6

A student studies the same amount of time each day for a test. In 4 days she studied 60 minutes. Which equation shows this relat

ionship Let the number of days. A y B y C y

Mathematics
2 answers:
solniwko [45]3 years ago
7 0

b i think dose this help u


enot [183]3 years ago
7 0
The equation is 4x=60. If you divide both sides by 4, you end up with x=15, which is the number of minutes she studied each day for the test. You can also substitute the variable (x) for d, (days, or 1 day of studying).
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Answer:

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<u>Step-by-step explanation</u>:

<u><em>Explanation</em></u>:-

Given mean of the Population 'μ ' = 51 months

Standard deviation of the Population 'σ' = 11 months

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<em>Let    'X'  = 73</em>

<em></em>Z = \frac{x-mean}{S.D} = \frac{73-51}{11} = 2<em></em>

<em>Let  'X' = 84</em>

<em></em>Z = \frac{84-51}{11} = 3<em></em>

<em>The approximate percentage of cars that remain in service between 73 and 84 months</em>

<em>P( 73 < x < 84 )      = P( 2 < Z < 3)</em>

<em>                               = P( Z<3) - P( Z <2)</em>

<em>                              =  0.5 + A(3) - ( 0.5 + A(2))</em>

<em>                             = A(3) - A( 2)</em>

<em>                             = 0.49865 - 0.4772     ( From Normal table)</em>

<em>                             = 0.02145</em>

<em>  P( 73 < x < 84 ) = 0.02145</em>

<em>The approximate percentage of cars that remain in service between 73 and 84 months</em>

<em>P( 73 < x < 84 ) = 0.02145 = 2.1 %</em>

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