A student measured the volume of gas produced in 30 seconds from a reaction between 2g of magnesium and 20cm' of 2 mol/dm hydrochloric
acid. The student repeated the experiment 5 times and the volumes
collected (cm) were: 13.5, 13.1. 17.5, 13.7 and 13.0. Calculate the mean,
discounting any anomalies.

Step-by-step explanation:

Observation = 13.5, 13.1, 17.5, 13.7, 13.0

No. of Observations = 5

=> Mean =

=> Mean =

=> Mean =

=> Mean = 14.16

a4 - 3a2 - 1

step-by-step explanation:

step   1   :

equation at the end of step   1   :

  ((a4) -   3a2) -   1

step   2   :

trying to factor by splitting the middle term

2.1     factoring   a4-3a2-1  

the first term is,   a4   its coefficient is   1 .

the middle term is,   -3a2   its coefficient is   -3 .

the last term, "the constant", is   -1  

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