4. Hallar la longitud de un arco circular. (

= 3,14).
a. Si el ángulo central mide "rad en una circunferencia cuyo radio mide 1.5 km
b. Si el ángulo central mide 62 en una circunferencia cuyo radio mide 9 cm​

Aproduction manager test 10 toothbrushes and finds that their mean lifetime is 450 hours. she then design sales package of this type of toothbrush. it states that the customers can expect the toothbrush to last approximately 460 hours. this is an example of what phase of inferential statistics