Type firm 1966 1970 1974 petroleum 11.2 9.3 12.7 drugs 10.8 9.4 12.2 chemicals 8.0 5.0 8.2 motor vehicles 6.2 2.4 2.7 electrical 4.8 3.3 3.9 food 2.7 2.5 2.8

which industry had the greatest percentage increase in profits as a percentage of sales between 1970 and 1974?

what was the percentage increase?

Chemical industry had the greatest percentage increase in profits as a percentage of sales between 1970 and 1974 i.e. 64 %

Step-by-step explanation:

Type firm :       1966        1970      1974

Petroleum        11.2          9.3        12.7

Drugs                10.8          9.4        12.2

Chemicals         8.0          5.0          8.2

Motor Vehicles 6.2          2.4           2.7

Electrical           4.8          3.3           3.9

Food                  2.7          2.5           2.8

Now we need to check increase in percentage of sales between 1970 and 1974

Sale of petroleum in 1970 = 9.3

Sale of petroleum in 1974 = 12.7

So, increase = 12.7-9.3 =3.4

So, percentage of increase in petroleum =

                                                                    =

                                                                    =

Sale of drugs in 1970 = 9.4

Sale of drugs in 1974 = 12.2

So, increase = 12.2-9.4 =2.8

So, percentage of increase in drugs  =

                                                              =

                                                              =

Sale of chemicals in 1970 = 5

Sale of chemicals in 1974 = 8.2

So, increase = 8.2-5 =3.2

So, percentage of increase in chemicals =

                                                                  =

                                                                   =

Sale of motor vehicles in 1970 = 2.4

Sale of motor vehicles in 1974 = 2.7

So, increase = 2.7-2.4 =0.3

So, percentage of increase in vehicles  =

                                                                  =

                                                                  =

Sale of electrical in 1970 = 3.3

Sale of electrical in 1974 = 3.9

So, increase =3.9-3.3 =0.6

So, percentage of increase in electrical  =

                                                                   =

                                                                   =

Sale of food in 1970 = 2.5

Sale of food in 1974 = 2.8

So, increase =2.8-2.5 =0.3

So, percentage of increase in food =

                                                         =

                                                         =

Chemical industry had the greatest percentage increase in profits as a percentage of sales between 1970 and 1974 i.e. 64 %

hello,

b) 62.47% of the students are between 14 and 18 years old.

step-by-step explanation:

mean = 15 and standard deviation = 2

student between 14 to 18

formula used z-score

for age 14 , z score

using z-table , p(z> -0.5)=0.3085

for age 18 , z score

using z-table , p(z< 1.5)=0.9332

p(-0.5< z< 1.5)=0.9332-0.3085 = 0.6247

thus, 62.47% of the students are between 14 and 18 years old.

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