Question

Pls help me only good answers​

Answer 1

Answer:

$\huge{\underline{\underline{Given→}}}$

$\rm\green{Observations=17,15,18,15,10}$

$\rm\green{No.of\:observations=5}$

$\huge{\underline{\underline{To\:Find→}}}$

$\rm\purple{Mean\:of\:the\:given\:data}$

$\huge{\underline{\underline{Answer→}}}$

${\boxed{\red{\dashrightarrow}{\rm{\red{Mean=\dfrac{\rm{\small{Sum\:of\:all\:observations}}}{\rm{\small{No.of\:observations}}}}}}}}$

$\rm\blue{→\bar{x}=\dfrac{17+15+18+15+10}{5}}$

$\rm\blue{→\bar{x}=\dfrac{75}{5}}$

$\rm\blue{→\bar{x}=\dfrac{\red{\cancel{\blue{75}}}}{\red{\cancel{\blue{5}}}}}$

$\rm\blue{→\bar{x}=15}$

${\boxed{\boxed{\rm{\pink{→\bar{x}=15✔}}}}}$

☞ Hence the mean of the given data is 15 which is the required answer.

HOPE IT HELPS.

Answer 2

Answer:

DAC= DBA ( Alternate interior angles )

DBA= 30°

x= 30°

In triangle DAB

DAB + ABD + BDA = 180° ( Angle sum property of a triangle )

80° + 30° + y = 180°

110° + y = 180°

y = 180° - 110°

y = 70°

In triangle DCB

DCB + CBD + BDC = 180° ( Angle sum property of a triangle )

z + y - 30° + 30° = 180°

z + 70° - 30° + 30° = 180°

z + 40° + 30° = 180°

z + 70° = 180°

z = 110°