(b) Jason spent \( \frac{3}{8} \) of his salary on food and clothes and gave the remaining Rs 7000 to his mother. His clothes cost Rs 1550 . How much did he spend on food?

\( 6_{75} x \) is the standard deviation of a set of numbers \( \{a, b, c, d, e\} \). For each of the following sets, which one(s) also have a standard deviation equal to \( x \) ? \( \begin{array}{ll}\text { A) }\{a+1, b+1, c+1, d+1, e+1\} & \text { B) }\{a-1, b-1, c-1, d-1, e-1\} \\ \text { C) }\{1-a, 1-b, 1-c, 1-d, 1-e\} & \text { D) }\left\{a^{2}, b^{2}, c^{2}, d^{2}, e^{2}\right\}\end{array} \)

n la parte superior de la capilla de un pueblo hay un campanario. Una persona lo puede ver desde la calle 18 m con un ángulo de \( 60^{\circ} \). ¿Cuânto se debe alejar para observarlo con un ângulo de \( 45^{\circ} \) ?

If : \( \sin \left(y+7^{\circ}\right)=0.5 \), then \( y=\cdots \ldots \ldots l \) \( \begin{array}{llll}\text { (a) } 23 & \text { (b) } 30 & \text { (c) } 53 & \text { (d) } 7\end{array} \)

f) \( 5^{x} \geq 0,2 \)

A runner completes 5 kilometers in 30 minutes. What is their speed in kilometers per hour?